How to fix Windows update error 0x80070306?

Install error 0x80070306 means a Windows 11 update downloaded but failed while Windows processed its packages. The code is Win32 error 774, a catch-all "one or more errors occurred", so the real cause is a few lines earlier in CBS.log. Check your build, skip a failed preview, then read the log.

Facts checked on 15 October 2026. Steps written for Windows 11 (25H2 and 26H2) and Windows 10 22H2.

What install error 0x80070306 means

0x80070306 is an ordinary Windows system error in the eight-digit form that Windows Update prints. The first half, 0x8007, marks a Win32 error wrapped for the update components. The second half, 0306, is 774 in decimal. Microsoft's list of system error codes names 774 ERROR_ERRORS_ENCOUNTERED, with the text "One or more errors occurred while processing the request."

That text is a summary, not a reason. Windows returns it when a step inside the update failed and the installer gave up. The step that failed writes its own error in CBS.log a few lines earlier, and that is the line that tells you which fix you need.

Which Windows updates fail with 0x80070306

The code is not tied to one update. People search it together with many KB numbers over more than a year, from the 2025 cumulative updates for 24H2 to the 2026 updates for 25H2. The two cases below are the ones we read in full. They are user reports, not statements by Microsoft.

• Other KB numbers searched with this code include KB5053656, KB5058411, KB5062553, KB5063060, KB5070773, KB5077181, KB5077241, KB5089549 and KB5089573. We did not read a case for each, so we do not claim a cause for them.
• Windows 11 24H2 Home and Pro stopped getting monthly updates on 13 October 2026. On such a PC the lasting fix is a move to 25H2 or 26H2, which Fix 7 does in one step.
• Windows 10 left support on 14 October 2025. We found no Windows 10 report of this code.

Why Windows update error 0x80070306 happens, from most to least likely

Microsoft has not published a cause for this code in Windows Update. The ranking below follows the log lines in the solved case and what the code itself says: an earlier step failed. Each cause points to the fix that matches it.

How to fix install error 0x80070306 in Windows Update

Fix 1 takes ten minutes and changes nothing, so everybody starts there. Fix 2 tells you which of the next fixes is yours. Fixes 3 to 6 repair one cause each. Fix 7 is the repair install, which rebuilds Windows and keeps your files and apps.

Fix 1. Check your build, skip a failed preview update and install the newest update

10 minutesNo riskAlways first, and above all when the failing update is a preview or a month or more old.

Preview updates are optional, non-security updates whose changes arrive in the next month's regular update. When only a preview fails with 0x80070306, skipping it costs nothing. The build number shows whether a newer update already replaced the failed one.

1. Restart the PC once with Start > Power > Restart, so that pending update work can finish.
2. Press Win + R, type winver and press Enter. Note the version (24H2, 25H2 or 26H2) and the OS Build.
3. Open Settings > Windows Update > Update history and note the full name of the failed update and its KB number.
4. If the name contains Cumulative Update Preview, you can skip it. Go to Settings > Windows Update and set Get the latest updates as soon as they're available to Off.
5. If it is a regular monthly update, search its KB number on Microsoft Support. The page title gives the OS build it installs.
6. If your build in winver is the same or higher, the update is in place. If it is lower, select Check for updates and install what is offered now.

Fix 2. Find the failing package in CBS.log

15 minutesNo riskA regular monthly update fails with 0x80070306 and you want to know which of the next fixes is yours.

Error 774 only says that an earlier step failed. CBS.log, the log of the part of Windows that installs updates, records that earlier step. In the solved case it named the package Windows could not resolve.

1. Right-click Start and select Terminal (Admin). On Windows 10, search for cmd and select Run as administrator.
2. Copy the log to the desktop, so that you read a copy while Windows keeps writing the original.

   copy %windir%\Logs\CBS\CBS.log %USERPROFILE%\Desktop\CBS-copy.log

3. List the lines that carry the code. Note the time of the last hit.

   findstr /i /c:"80070306" %USERPROFILE%\Desktop\CBS-copy.log

4. List the lines that say which package could not be found.

   findstr /i /c:"Unable to resolve" /c:"ERROR_NOT_FOUND" %USERPROFILE%\Desktop\CBS-copy.log

5. Open CBS-copy.log in Notepad, go to the time of the last hit and read 20 to 40 lines above it. Note every package, feature and file name.

The lines from the solved KB5079473 case, as the thread quotes them

Failed to get package store registry key to load all packages. [HRESULT = 0x80070490 - ERROR_NOT_FOUND]
Unable to resolve Package: @Foundation; skipping MFL processing for Update: CumulativeUpdate_KB5079473: HRESULT_FROM_WIN32(1168)

Error 1168 and 0x80070490 are the same Windows error, ERROR_NOT_FOUND: Windows looked for a package record and it was not there. That is why a plain reset of the download cache does not help with this code.

Fix 3. Repair system files and the component store with SFC and DISM

30 minutesLow riskThe log names damaged files, or you have no clear cause yet.

The update changes system files using the copies in the component store. In the solved case SFC found and repaired a damaged driver file before the update could go further. Repaired files remove one of the failures that end in error 774.

Run DISM RestoreHealth first and System File Checker second, then restart and try the update. Step by step:

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

Fix 4. Remove and add back the optional feature named in the log

15 minutesLow riskCBS.log names an optional feature or capability next to Unable to resolve Package or ERROR_NOT_FOUND.

Optional features, which Windows calls capabilities, are packages the cumulative update must update too. If one is half installed, the update cannot resolve it and fails. In the solved KB5079473 case, removing the Wireless Display feature let the update install.

1. Right-click Start and select Terminal (Admin).
2. List the installed optional features and save the list on the desktop.

   DISM /Online /Get-Capabilities /Format:Table > %USERPROFILE%\Desktop\capabilities.txt

3. Open capabilities.txt and find the feature that CBS.log named. Copy its full name, for example App.WirelessDisplay.Connect~~~~0.0.1.0.
4. Remove that feature. This is the command from the solved case.

   DISM /Online /Remove-Capability /CapabilityName:App.WirelessDisplay.Connect~~~~0.0.1.0

5. Restart the PC, open Settings > Windows Update and select Check for updates.
6. When the update has installed, add the feature back if you use it.

   DISM /Online /Add-Capability /CapabilityName:App.WirelessDisplay.Connect~~~~0.0.1.0

In the solved case the helpers also ran store repair scripts that they wrote for that one PC. Such a script is made from that PC's log and can harm another PC. Never run a script made for someone else.

Fix 5. Reset the Windows Update components and run the troubleshooter

15 minutesLow riskThe log points at the download or the update services, or you want the standard reset before a repair install.

A reset gives Windows Update an empty download cache and restarts its services, which clears a damaged download. It does not repair package records, so in the solved case it did not help. That is why it comes late here.

1. Open Command Prompt as administrator. Type cmd in the search box, right-click Command Prompt and select Run as administrator. Select Yes when Windows asks for permission.
2. Stop the update services. Type the commands below and press Enter after each one. If Windows says that other services depend on Cryptographic Services, it stops them too. A message that a service is not started is fine.

   net stop wuauserv
   net stop bits
   net stop cryptsvc

3. Delete the download queue files. This clears the list of downloads that the Background Intelligent Transfer Service keeps. If Windows says it cannot find the files, continue.

   del "%ALLUSERSPROFILE%\Application Data\Microsoft\Network\Downloader\qmgr*.dat"

4. Rename the update cache folders. Renaming keeps a copy in case you need it; Windows creates new, empty folders when the services start again. If you get Access is denied, a service is still running: repeat the previous step.

   ren %systemroot%\SoftwareDistribution SoftwareDistribution.old
   ren %systemroot%\System32\catroot2 catroot2.old

5. Start the services again. Type the commands below and press Enter after each one. The requested service has already been started is fine: Windows started it on its own.

   net start cryptsvc
   net start bits
   net start wuauserv

6. Restart and check for updates. Restart the PC. Then select Start > Settings > Windows Update > Check for updates. The first check can take longer than usual because everything is downloaded again.

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: Reset Windows Update components

Then run the built-in troubleshooter once: Run the Windows Update troubleshooter. If the system drive is nearly full, free space first, because an update needs room to stage its files: Free up disk space and delete temporary files

Fix 6. Install the update by hand from the Microsoft Update Catalog

20 to 40 minutesLow riskYou want to rule out Windows Update itself, or you install updates from the catalog anyway.

A manual install skips the Windows Update download and service chain. If the manual install also fails with 0x80070306, you know for sure the cause is in the packages on the PC.

1. Check your Windows version. Press Windows key + R, type winver and press Enter. Note the version (for example 25H2) and the OS build.
2. Find the KB number. Open Settings > Windows Update. A failed or pending update is listed with its KB number; earlier ones are under Update history.
3. Check the processor type. Open Settings > System > About and look at System type: an x64-based PC needs the x64 file, an ARM-based PC (for example Snapdragon) needs the arm64 file.
4. Search the catalog. Open the Microsoft Update Catalog at catalog.update.microsoft.com in your browser, type the KB number (for example KB5124010) in the search box and press Enter.
5. Pick the right row. Find the row whose title names your Windows version and your processor type (x64-based or arm64-based) and select Download on that row.
6. Download every file listed. A window lists one or more .msu links. Download all of them into one empty folder, for example C:\packages. On Windows 11 24H2 and later the list can include earlier checkpoint updates that the new one needs.
7. Install a single file. If there is only one file, double-click it and confirm the installation in the Windows Update Standalone Installer.
8. Install several files with DISM. If there are several files, open an elevated Terminal or Command Prompt and run DISM with the newest file. DISM finds the other files in the same folder and installs them in the right order.

   DISM /Online /Add-Package /PackagePath:C:\packages\<newest-file>.msu

9. Restart. Restart the PC when the installation finishes, then run winver again: the OS build should have changed.

These steps were written for Windows 11 24H2 and later; Windows 10 22H2. The full page with the other versions and what each result means: Install an update from the Microsoft Update Catalog

• More than one file. Windows 11 24H2 and later updates can list a checkpoint update first. Install the files in the order the catalog gives.
• The same error by hand. The download was never the problem. Go back to Fix 2 and read the log, or go to Fix 7.

Fix 7. Reinstall Windows over itself and keep your files and apps

1 to 2 hoursLow riskEvery other fix failed, the log names a package you cannot repair, or the PC runs Windows 11 24H2 Home or Pro.

A repair install writes a fresh copy of Windows with a new component store and new package records, and keeps apps, files and settings. It replaces exactly the records that error 774 failed on.

1. Open Settings > System > Recovery.
2. Next to Fix problems using Windows Update, select Reinstall now.
3. Confirm, keep the PC on and let it restart as often as it needs.
4. When Windows is back, run winver, then select Check for updates in Windows Update.

If Reinstall now is missing or fails, use installation media. Download the Windows 11 ISO from Microsoft's software download page, right-click it, select Mount and run setup.exe. On Ready to install, check that it says Keep personal files and apps before you select Install.

More reset options, including the ones that remove apps: Reinstall Windows without losing files

If 0x80070306 is still there: the logs to read and what to send

When the log names a package that none of the fixes above reach, the next step is a person who reads CBS logs for a living. Microsoft Q&A and the Sysnative Windows Update forum both take such cases. Collect the log right after a failed attempt.

PowerShell (administrator): pack the CBS logs into one file on the desktop

Compress-Archive C:\Windows\Logs\CBS -f (Join-Path ([Environment]::GetFolderPath('Desktop')) 'CBS.zip')

• What to send: CBS.zip, the output of winver, the KB number, the dates from Update history and what you already tried.
• One test with the antivirus paused. If you use an antivirus other than Microsoft Defender, pause it for one attempt and turn it back on right after: Turn off Microsoft Defender protection for a moment
• A work or school PC. Updates may come from your organization's server. Send the logs to the administrator before a repair install.
• Is it hardware? Nothing in the cases we read pointed at hardware. If SFC finds new damage after every repair, check the drive.

How to keep install error 0x80070306 from coming back

Each point follows from what the code means. Error 774 appears when the update finds a package it cannot process. Anything that removes or damages package records or store files leaves the next update with the same problem.

Frequently asked questions

What does install error 0x80070306 mean?

It means a Windows update failed while Windows processed its packages. The code is Win32 error 774 in the form Windows Update uses. Microsoft names 774 ERROR_ERRORS_ENCOUNTERED, "One or more errors occurred while processing the request". That is a summary, so the reason is a few lines earlier in CBS.log. In the case we read in full, the earlier line said Windows could not resolve a package, and the fix was to remove a broken optional feature.

Can I just skip the update that fails with 0x80070306?

If it is a preview update, yes. Previews are optional, non-security updates, and their changes come in the next month's regular update. That is the answer an independent advisor gave on Microsoft Q&A for the 2025-07 preview KB5062660. A regular monthly update carries security fixes, so do not skip it for long. If next month's regular update fails with the same code, the cause is on the PC, and Fix 2 shows where to look.

Which updates fail with error 0x80070306?

We read two cases in full: the July 2025 preview KB5062660 on Windows 11 24H2 and the monthly update KB5079473 on Windows 11 25H2. People search the code with many other KB numbers too, including KB5062553, KB5058411, KB5070773 and KB5089549. The code follows the PC rather than one update. When one PC fails month after month, repair the PC instead of waiting for Microsoft to change the update.

What is 0x80070306(-2147024122)?

It is the same error written twice. -2147024122 is the value of 0x80070306 when a program reads it as a signed 32-bit number, and some logs and tools print both. The meaning does not change: Win32 error 774, "One or more errors occurred while processing the request". Every fix on this page applies, starting with the build check in Fix 1 and the log in Fix 2.

Is 0x80070306 a known issue that Microsoft is fixing?

We could not find it as a known issue. Microsoft documents only the generic meaning of error 774, and we found no statement that a later update fixes it. In the cases we read, the cause was on the individual PC: a package or optional feature Windows could not process. That is why the same PC can fail several updates in a row while other PCs install them without trouble.

I see "Chyba instalace - 0x80070306" or "Erro de instalação - 0x80070306". Is it the same error?

Yes. Windows prints the same code in every language, and only the words in front of it change. "Chyba instalace" is Czech, "Erro de instalação" is Portuguese, "Errore di installazione" is Italian, "Installatiefout" is Dutch and "Installationsfehler" is German, and all of them mean install error. The cause and every fix on this page are the same. Menu names in Settings are translated, but commands such as winver, DISM and sfc /scannow are typed the same way everywhere.

SFC and DISM say everything is fine. Why does the update still fail?

Because the problem can be a package record, not a file. SFC checks protected system files and DISM checks the component store, but neither rebuilds a missing package record or a half-installed optional feature. That was the situation in the solved KB5079473 case: DISM reported no corruption, and the update installed only after the Wireless Display feature was removed. Read CBS.log as in Fix 2 to find the package.

Will a repair install delete my files or programs?

Not when you keep personal files and apps. Reinstall now in Settings > System > Recovery and setup.exe from Windows 11 media are both built to keep your files, apps and settings. With setup.exe, check the Ready to install screen: it must say Keep personal files and apps before you select Install. Back up your important files anyway, because a repair install is a large operation, and some apps may ask you to sign in again.

Should I turn off my antivirus to fix 0x80070306?

Not for good. No case we read was solved by the antivirus, and the code points at package processing, not at blocked files. If you use an antivirus other than Microsoft Defender, you can pause it for one attempt and turn it back on right after, whatever the result. If the update still fails, the antivirus is not the cause, so continue with the log in Fix 2.