How to Fix "Windows could not start the Windows Defender Service service on Local Computer" Error?

by Alice Woods - -


Issue: How to Fix "Windows could not start the Windows Defender Service service on Local Computer" Error?

I can’t launch Windows Defender as “Windows could not start the Windows Defender Service service on Local Computer. Error 577” message pops up. Disabled my anti-virus and tried to rerun the program but to no avail. I’d appreciate your help.

Solved Answer

“Windows could not start the Windows Defender Service service on Local Computer” notification is the error message some Windows 10 users may encounter. Usually, this problem occurs due to conflicting Windows Defender program with third-party tools present on the system.

Since the introduction of the utility the program, Microsoft has warned about such issues and, likewise, suggested using only one tool: either Defender or a third-party tool. On the other hand, the software does not cause troubles while cooperating with malware elimination tools, e.g. Malwarebytes Anti-malware.The image displaying Windows Defender 577 error

Furthermore, though the program may conflict with certain anti-virus tools, it does not negate them entirely. In fact, this Windows Defender error 577 appears a result of the external program modifying its registry files. Thus, let us provide solutions. 

Option 1. Use Registry Editor to fix Windows Defender Error 577

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Change DWORD (32-bit) value from 0 to 1

Step 1.

  1. Click on Windows key+R.
  2. Type regedit.
  3. Once the program launches, enter the following path: HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows Defender
  4. Once the folder expands, you will find two registry files named DisableAntiSpyware and DisableAntiVirus on the right side of the panel.
  5. Double click on both of them and check that DWORD (32-bit) value is set to 1. If necessary, change it to 1 from 0 and click OK.
  6. Restart the device, if a notification prompts.

Step 2.

Due to these changes, another notification may appear: “This app is turned off by group policy.” Follow these steps:

Make sure Windows Defender is disabled in local group policy

  1. Click on Start button and type local group.
  2. Choose Edit group policy suggestion.
  3.  Select Computer Configuration. Then expand Administrative Templates. Go to Windows components.
  4. Find Windows Defender.
  5. On the right side of the panel, you will see option Turn off Windows Defender. Double- click and place the checkmark on Disabled option. Finish the action by clicking Apply and OK.
  6. Launch Windows Defender.

Option 2. Ensure the protection of your computer

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Some users complain that they the error appears, but they cannot find the software listed in Registry Editor or Local Group Policy components. Make sure there is no malicious presence on the system. In case, you suspected unusual behavior, scan the computer with malware elimination utility in Safe Mode. Besides Advanced settings in the pre-boot mode, you can activate the mode via these steps:

Launch Safe boot mode

  1. Click on Start button.
  2. Type system configuration.
  3. Launch the program. Enter Boot section and mark Safe Boot option. Click Apply and then OK. The next time you boot the computer, it will launch in Safe Mode. To deactivate it, remove the checkmark from Safe Boot and restart the PC.


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Prevent websites, ISP, and other parties from tracking you

Private Internet Access is a VPN that can prevent your Internet Service Provider, the government, and third-parties from tracking your online and allow you to stay completely anonymous. The software provides dedicated servers for torrenting and streaming, ensuring optimal performance and not slowing you down. You can also bypass geo-restrictions and view such services as Netflix, BBC, Disney+, and other popular streaming services without limitations, regardless of where you are.

A VPN is also crucial when it comes to user privacy. Online trackers such as cookies can not only be used by social media platforms and other websites but also your Internet Service Provider and the government. Even if you apply the most secure settings via your web browser, you can still be tracked via apps that you are connected to the internet. Besides, privacy-focused browsers like Tor is are not an optimal choice due to diminished connection speed.

Therefore, to stay completely anonymous and prevent the ISP and the government from spying on you, you should employ Private Internet Access VPN. It will allow you to connect to the internet while being completely anonymous, prevent trackers, ads, as well as malicious content. Most importantly, you will prevent the illegal surveillance activities that NSA and other governmental institutions are performing behind your back.


Recover your lost files quickly

Unforeseen circumstances can happen at any time while using the computer: it can turn off due to a power cut, a Blue Screen of Death (BSoD) can occur, or random Windows updates can decide to reboot the machine when you went away for a few minutes. As a result, your schoolwork, important documents, and other data might be lost.

Additionally, you might also be attacked by malware that can corrupt your Windows or encrypt files with a robust encryption algorithm, and ask for a ransom in Bitcoin for the decryption tool. Cybercriminals might not deliver what they promised, however, so it is better to attempt alternative file recovery methods that could help you to retrieve at least some portion of the lost data.

Data recovery software is one of the options that could help you recover your files. Once you delete a file, it does not vanish into thin air – it remains on your system as long as no new data is written on top of it. Data Recovery Pro is recovery software that searchers for working copies of deleted files within your hard drive. By using the tool, you can prevent loss of valuable documents, school work, personal pictures, and other crucial files.

About the author
Alice Woods
Alice Woods - Shares the knowledge about computer protection

Alice Woods is a security expert who specializes in cyber threat investigation and analysis. Her mission on Ugetfix - to share the knowledge and help users to protect their computers from malicious programs.

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