Taskhostw.exe high CPU usage: what it is and how to fix it

Taskhostw.exe is the Host Process for Windows Tasks: Task Scheduler starts it to run tasks that are built as DLL handlers. A short burst of CPU is normal. If it stays high, find which task it is running, then scan, repair system files and test with a clean boot.

Facts checked on 16 October 2026. Steps written for Windows 11 (25H2 and 26H2) and Windows 10 22H2, with Task Scheduler behaviour read from Microsoft Learn on 16 October 2026.

What taskhostw.exe (Host Process for Windows Tasks) is and what the name means

Taskhostw.exe is the name of a Windows program that Task Manager lists as Host Process for Windows Tasks. It has no window. Task Scheduler starts it when a scheduled task needs a place to run its code. Microsoft's Task Scheduler documentation describes this kind of task as a COM handler action: a class in a DLL that Task Scheduler starts and stops through a Windows interface, instead of a normal program file.

In the Task Scheduler window those tasks show the action Custom Handler. A user on Microsoft Q&A who looked for the task behind the process found exactly that: several tasks with the action Custom Handler and a location that did not exist as a folder. We found no Microsoft page that names taskhostw.exe as the host of these handlers, so treat that link as the common understanding, not a quote.

Process name

Host Process for Windows Tasks (Processes page), taskhostw.exe (Details page)

Started by

Task Scheduler, for tasks with a Custom Handler action

Several copies

Normal. One reader saw three copies with no CPU, disk or network use while they waited for work.

Expected folder

C:\Windows\System32 (our check with Open file location, not a statement from a Microsoft page)

Older name

taskhost.exe. We found no Microsoft page that explains the change to taskhostw.exe.

People type the name in other forms, and one answer covers all of them: taskhostw, taskhostw exe, "taskhostw.exe" and taskhostw.exe taskhostw. A search for taskhostw.exe user is about the account it runs under, which the Details tab shows in the User name column.

Is taskhostw.exe a virus, and how much CPU is normal for it?

The genuine file is part of Windows and is not a virus. An agent on Microsoft Q&A says the process executes scheduled tasks, and advises looking at the scheduled tasks if it launches often, because miners can hide there. The name alone proves nothing: malware likes to copy the name of a Windows file, so the folder and the signature are the test (Fix 1).

Why taskhostw.exe uses a lot of CPU, from most to least common

Microsoft has no article that lists causes, so this ranking comes from how Task Scheduler works and from the reports on Microsoft Q&A, said as reports. Each cause points to the fix that tests it.

• Users on Microsoft Q&A report 20 to 30% CPU for 10 to 30 seconds, every so often, on a Windows 11 laptop.
• A Windows 10 user reported the disk at 100% for hours, with taskhostw.exe on top and the files in use looking like updates or installs. They also saw three Data Integrity Scan tasks in Task Scheduler with the action Custom Handler.
• A support reply in that thread told the reader to disable a task named taskhostw.exe in Task Scheduler. The reader could not find any task with that name or display name, which is right: taskhostw.exe is the host, and the task has another name.

How to fix taskhostw.exe high CPU usage

Start with Fix 1 and Fix 2 even if you are sure the file is genuine: together they take about seven minutes and tell you which task to blame. Fix 3 to Fix 6 repair or test the PC. Fix 7 changes a task and Fix 8 and Fix 9 roll Windows back, so keep them for last.

Fix 1. Check that taskhostw.exe is the real Windows file

3 minutesNo riskEveryone, before changing anything on the PC.

Malware sometimes takes the name of a Windows process. A file in the System folder with a valid Microsoft signature means the rest of this page applies. Any other result means Fix 4.

1. Press Ctrl + Shift + Esc to open Task Manager and select the CPU column on the Processes page to sort it.
2. Find Host Process for Windows Tasks and note how long it stays near the top. A minute or less is a normal run.
3. Open the Details page, right-click taskhostw.exe and select Open file location.
4. Check the folder in File Explorer. The expected folder is C:\Windows\System32.
5. Right-click the file, select Properties and open the Digital Signatures tab. The signer should be Microsoft Windows or Microsoft Corporation.
6. In the Details page of Task Manager, also read the User name column. The process runs under your account, SYSTEM or a service account, depending on the task.

The same signature check in PowerShell, while the process is running (no administrator rights needed):

Get-Process taskhostw | ForEach-Object { Get-AuthenticodeSignature $_.Path } | Format-List Path, Status, SignerCertificate

Status must read Valid, and the certificate subject must name Microsoft. Several lines for several copies of the process are normal. If Get-Process finds nothing, the host is not running at that moment, which is also normal.

Fix 2. Find which task is running inside taskhostw.exe

5 minutesNo riskHigh CPU lasts for minutes and you want to know which program or Windows feature is behind it.

The host only runs tasks that Task Scheduler gives it, so the load belongs to one of those tasks. Name the task, and you can tell whether it is a Windows task, a program's task or something unknown.

1. Wait until Task Manager shows taskhostw.exe busy, so a task is running right now.
2. Select Start, type Task Scheduler and open it.
3. In the Action menu, select Display All Running Tasks. The window lists the tasks that are running at this moment, with the start time of each.
4. Select Action > Enable All Tasks History so Windows records every task from now on. Open the History tab of a task later to see when it started and how it ended.
5. Expand Task Scheduler Library in the left pane and look at the Triggers and Actions tabs of the running tasks you found. A task with the action Custom Handler is the type the host runs.
6. Write down the name and the folder of the task. A folder named Microsoft > Windows means a Windows task; a folder with a company or program name means a third-party task.

Task Scheduler does not always show a running task when the burst is short, because it ends before you look. In that case the history from step 4 is what you read the next day.

Fix 3. Check Reliability Monitor for taskhostw.exe crashes

5 minutesNo riskYou see an Application Error or Access Denied message, or the CPU load comes and goes in a loop.

A host that crashes and is started again by Task Scheduler can use the CPU all the time. Reliability Monitor lists those crashes with a date, so you see whether taskhostw.exe or a task behind it keeps failing.

1. Open Control Panel and select System and Security.
2. Select Security and Maintenance.
3. Under Maintenance, select View reliability history.
4. Click a red cross in the chart for a day with problems and read the list under it. Look for entries that name taskhostw.exe or Host Process for Windows Tasks.
5. Select View all problem reports at the bottom of the window and open the entry for taskhostw.exe to read its details.
6. Note the faulting module (the DLL file name) if one is shown. It tells you which program or Windows feature owns the failing code.

You do not need to clear the problem reports. They take almost no space, and the list is what support or a repair needs to see.

Fix 4. Scan for malware with Microsoft Defender

15 minutes or moreNo riskThe file failed Fix 1, you see tasks you did not create, or the CPU stays high with few programs open.

Cryptocurrency miners and other malware can schedule their own tasks or reuse the host's name. A Microsoft Q&A adviser names scheduled tasks as the place to look, and a scan is the first check.

1. Open Windows Security. Select Start, type Windows Security and open the app.
2. Open Virus & threat protection. Select Virus & threat protection. Under Current threats you see when the last scan ran, how long it took and how many files it checked.
3. Run a quick scan. Select Quick scan. If Windows Security thinks a deeper scan is needed, it tells you when the quick scan is done.

   

4. Open Scan options. If the quick scan finds nothing and you still suspect an infection, select Scan options under Current threats.
5. Run a full scan. Select Full scan and start it. It checks every file and program on the device, so it takes much longer than a quick scan. Leave the PC on until it ends.

   

6. Or scan one folder. To check only a download or a USB drive, select Custom scan in Scan options and choose the folder. You can also right-click a file or folder in File Explorer and select Scan with Microsoft Defender. On Windows 11 you may have to select Show more options first.
7. Read Protection history. Go back to the first page of Windows Security and select Protection history. Select a card to expand it and see the details.

   

These steps were written for Windows 11 25H2 and 26H2, Windows 10 22H2. The full page with the other versions and what each result means: How to scan for malware with Microsoft Defender

Run the Microsoft Defender Offline scan from the same Scan options page if the quick scan finds nothing and the load continues. It restarts the PC and scans outside Windows. Do not delete taskhostw.exe from System32 yourself: a genuine copy is needed, and sfc in Fix 5 restores it if a scan quarantines a damaged one.

Fix 5. Repair Windows system files with DISM and SFC

20 minutesLow riskYou see Access Denied or Application Error messages, or Fix 3 showed crashes inside Windows components.

The old version of this page put system file damage first. SFC compares protected Windows files with the stored copies and replaces bad ones. DISM repairs the stored copies themselves.

1. Open an elevated command window. Right-click Start and select Terminal (Admin), or type cmd in the search box, right-click Command Prompt and select Run as administrator. Select Yes when Windows asks for permission.

   

2. Run DISM first. Type the command below and press Enter. DISM downloads clean copies of damaged components from Windows Update, so it can take several minutes. Wait until it says The operation completed successfully.

   DISM.exe /Online /Cleanup-Image /RestoreHealth

   

3. Run System File Checker. In the same window, type the command below and press Enter. Do not close the window until the verification reaches 100%.

   sfc /scannow

   

4. Read the result and restart. Compare the last message with the table below this guide, then restart the PC so that repaired files are loaded.

   

These steps were written for Windows 11 24H2 and 25H2. The full page with the other versions and what each result means: Run DISM and SFC to repair Windows system files

Typed in an administrator PowerShell or Terminal, in this order (note the spaces, the old guide had them wrong):

sfc /scannow
dism.exe /Online /Cleanup-Image /RestoreHealth

Restart Windows when both commands finish, then watch Task Manager for a day of normal use.

Fix 6. Do a clean boot to find a program that causes the load

20 minutesLow riskFix 2 pointed to a third-party task, or nothing earlier explained the load.

A clean boot starts Windows with only Microsoft services and no startup programs. If taskhostw.exe is calm there, a program you installed owns the task, and you can find it by turning items back on in groups.

1. Open System Configuration. Select Search on the taskbar, type msconfig and select System Configuration from the results.
2. Hide Microsoft services. On the Services tab, select the Hide all Microsoft services check box. Only services from other companies stay in the list.

   

3. Disable the remaining services. Select Disable all, then select Apply.
4. Open Task Manager. On the Startup tab of System Configuration, select Open Task Manager.

   

5. Disable the startup apps. On the Startup apps tab in Task Manager, select each item whose status is Enabled and select Disable. Write down or take a screenshot of the items you disable: you need the list to turn them back on.

   

6. Confirm the changes. Close Task Manager. On the Startup tab of System Configuration, select OK.
7. Restart and test. Restart the PC. Windows now starts in a clean boot environment: try again the thing that failed (run the app, install the update, uninstall the program).

These steps were written for Windows 11 25H2 and 26H2. The full page with the other versions and what each result means: How to perform a clean boot in Windows

Turn the startup items back on half at a time and restart each time. The half that brings the load back holds the program. Update that program, repair it, or remove it with Uninstall a program or app in Windows if you do not need it.

Fix 7. Disable a third-party task that keeps starting

5 minutesRead the warningFix 2 or Fix 6 showed a task from a program that is not Microsoft, and updating that program did not help.

A task that fires too often or fails over and over keeps the host busy. Disabling that one task stops the load while the program stays installed, and you can switch it on again.

1. Open Task Scheduler and expand Task Scheduler Library.
2. Select the folder of the program (not a folder under Microsoft) and select the task you found.
3. Open the Actions tab and check that the action points to a file of that program.
4. Right-click the task and select Disable.
5. Restart Windows and watch taskhostw.exe for a day.
6. To undo it, right-click the same task and select Enable.

If the program is one you do not use, remove it with Uninstall a program or app in Windows instead. That deletes its tasks together with it.

Fix 8. Restore Windows to a point before the problem began

20 to 40 minutesLow riskThe load started after an update, a driver or a program, and a restore point from before it exists.

System Restore puts Windows files, drivers and settings back to an earlier day. It fits a problem with a known start date, which Reliability Monitor in Fix 3 shows.

1. Open System Restore. Press Windows+R, type the command below and press Enter. You can also open Control Panel > Recovery > Open System Restore. If a first page opens, select Next.

   rstrui.exe

2. Choose a restore point. Select a restore point from a time before the problem started. The Description often names the event, such as a driver or app install. If the one you need is missing, select Show more restore points (shown only when there are more).

   

3. See what will change. Select Scan for affected programs. The upper list shows programs and drivers that will be removed; the lower list shows those that might come back and may need to be reinstalled. Select Close.

   

4. Start the restore. Select Next, check the summary and select Finish. Windows restarts and applies the restore point. Do not turn the PC off.
5. Check the result. After sign-in Windows reports whether the restore succeeded. Check whether the problem is gone.

These steps were written for Windows 11 and Windows 10 (the steps are the same). The full page with the other versions and what each result means: Undo recent changes with System Restore

Pick a restore point from a day before the first crash in Fix 3 or before the first busy day you remember. Programs you installed after that day are removed, and your documents stay.

Fix 9. Reset Windows and keep your files

1 to 2 hoursRead the warningFix 1 to Fix 8 did not help and the PC is slow all day.

A reset installs a clean copy of Windows and removes damaged files and tasks of programs together. It is the final fix for a problem that sits in Windows itself.

1. Open Recovery in Settings. Open Settings > System > Recovery. Next to Fix problems using Windows Update, select Reinstall now. This keeps your apps, files and settings.

   

2. Start the reinstall. Choose whether the PC may restart on its own 15 minutes after the installation, then select OK.
3. Wait and restart. Windows Update downloads and installs a repair copy of your current Windows version. Keep the PC plugged in and online, and restart it when asked.
4. If that did not help: Reset PC. Back in Settings > System > Recovery, next to Reset this PC, select Reset PC. This keeps your personal files but removes installed apps and settings.
5. Choose Keep my files. Select Keep my files. Do not select Remove everything.

   

6. Choose where Windows comes from. Select Cloud download to download a fresh copy of Windows, or Local reinstall to use the files already on the PC (faster, but may not include the latest updates).
7. Reset. Review the summary and select Reset. The PC restarts several times.

These steps were written for Windows 11 22H2 and later. The full page with the other versions and what each result means: Reinstall Windows without losing files

If taskhostw.exe still uses a lot of CPU: what to collect and when it is hardware

A genuine host that stays busy after a scan, a repair and a clean boot is uncommon. Collect the details below before you ask for help, so nobody starts from zero. A Microsoft Q&A adviser asks for a scan log that lists the scheduled tasks and services first.

• Home users can post those details on Microsoft Q&A or ask through the Get Help app. On a work PC, give them to your IT desk.
• If the PC is hot and slow even with taskhostw.exe calm, look beyond it: dust, a failing fan or a small SSD can raise the CPU use of every process.
• A high CPU that never changes, whatever you close, with fans at full speed, can be a hardware or cooling fault. A technician can test it.

What not to do about taskhostw.exe: ending, deleting or blocking it

Ending the process stops the current load, but Task Scheduler starts it again at the next trigger. Deleting or renaming taskhostw.exe damages Windows and can stop sign-in tasks from running.

How to keep taskhostw.exe quiet from now on

• Install Windows updates when they are offered. Windows 10 left support on 14 October 2025, so plan the move to Windows 11.
• Keep programs that add background tasks up to date, and remove the ones you no longer use with Uninstall a program or app in Windows.
• Look at Task Scheduler once after you install a new program. A task from a program you do not know is worth a search.
• Let the PC finish its first busy minutes after sign-in. Many tasks start together at that moment, and the CPU settles by itself.
• Run a Defender scan now and then, and use Run DISM and SFC to repair Windows system files if Windows behaves oddly.

Frequently asked questions

What is taskhostw.exe and what does it do?

Taskhostw.exe is the file behind Host Process for Windows Tasks in Task Manager. Task Scheduler starts it to run tasks built as DLL handlers, which show the action Custom Handler in the Task Scheduler window. It has no window of its own, and several copies at once are normal. Microsoft's documentation describes the handlers but does not name the file, so we state this link as the common understanding. The CPU it uses belongs to the task it is running.

Is taskhostw.exe a virus?

The genuine file is part of Windows and is not a virus. A copy in another folder, a file without a valid Microsoft signature, or tasks you did not create point to malware that uses the name. Fix 1 shows the two checks, the folder and the digital signature, and Fix 4 shows the scan. A Microsoft Q&A adviser also tells readers to inspect the scheduled tasks, because miners can hide in them, so a Defender scan is the first step.

How do I fix taskhostw.exe high CPU usage?

Check the file (Fix 1), then find the task that runs inside it with Task Scheduler (Fix 2). Scan with Microsoft Defender (Fix 4) and repair system files with SFC and DISM (Fix 5). If the task belongs to a program, update, repair or remove that program (Fix 6 and Fix 7). Roll Windows back with System Restore (Fix 8) or reset it (Fix 9) only if nothing else worked.

Can I end or disable taskhostw.exe?

You can end it in Task Manager for the current run, but Task Scheduler starts it again at the next trigger, so this is not a fix. You cannot disable it as a task, because it is the host and not a task: a reader on Microsoft Q&A looked for a task with that name and found none. Disable only the third-party task that Fix 2 identifies, and keep the Microsoft > Windows tasks on. Fix 7 gives the steps and the undo.

Why are there several taskhostw.exe processes in Task Manager?

Several copies at once are normal. One reader on Microsoft Q&A saw three copies with no measurable CPU, disk or network use, apparently waiting for work. That is normal. Look at the User name column in the Details page: SYSTEM, a service account and your own account are all expected. Only a copy that stays busy or sits in the wrong folder needs action.

How do I fix the taskhostw.exe application error?

Open Reliability Monitor (Fix 3) and read the entry for taskhostw.exe, which shows the date and, in many cases, the faulting module. Repair system files with SFC and DISM (Fix 5), then run a clean boot (Fix 6) to see whether a program causes the crash. Users report the messages Taskhostw.exe, Application Error and Taskhost.exe, Application Error. We found no Microsoft page that gives these messages a meaning or a code.

What does Taskhostw.exe Access Denied mean?

Users report this message, but we found no Microsoft page that explains it, so we cannot state its meaning. It usually shows that a task hosted by the process could not open a file or a setting it needs. Start with Fix 5 to repair system files, then Fix 4 to rule out malware that changed permissions. If it keeps appearing for one task, Fix 2 tells you which program owns it.

What is taskhost.exe, and is it the same as taskhostw.exe?

Taskhost.exe is the older name of the same kind of host. On Windows 11 and Windows 10 the file you see is taskhostw.exe. We found no Microsoft page that explains the change, so we do not say more. Users sometimes search for one name and see the other. If a file named taskhost.exe runs on Windows 11 or 10, check its folder and signature with Fix 1, because a copy that is not signed by Microsoft is not part of Windows.

Why does taskhostw.exe use the disk when I have not started anything?

A task that Task Scheduler runs in the background can read and write files at any time. One reader saw the disk at 100% for hours and found the files in use looked like updates or installs, while Task Scheduler listed tasks named Data Integrity Scan. Wait for a task to finish when it follows an update, and use Fix 2 to name the task. Continuous heavy use is not normal. Run Fix 5 and Fix 6 then.

Will a reset delete my files?

Windows offers a reset that keeps your personal files, and Fix 9 uses it. Your installed apps and many settings are removed, so you must back up and write down what you need first. A reset is the last step: Fix 1 to Fix 8 solve most cases without it, and they do not remove programs, except System Restore, which removes programs installed after the restore point.