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How to Fix Windows Defender Error 577 in Windows 10

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Windows Defender Error 577

How to Fix Windows Defender Error 577 in Windows 10

Windows Defender is an anti-virus program that comes inbuilt with the windows OS. In the earlier versions of Windows, it was a normal anti-virus program that many users took as an optional service and they relied on third-party applications.

But in the later versions (from windows 8), the Windows Defender works as a complete anti-virus program providing all the features to save the System from Malware and other kinds of virus. Many users have reported the Windows Defender error 577 in windows 10. This problem occurs when the users have installed third-party anti-virus software on their PC.

Whenever we install third-party anti-virus software on our PC, the Windows Defender shuts down automatically to avoid conflict with the third-party application. Sometimes, the presence of malware alters the registry settings of our Windows OS that causes the Windows Defender error 577 in Windows 10. If you are one such user, this article is for you. Here, we will discuss every possible solution to this problem in detail.

Check for the malware on your PC:

  • This issue may be caused due to the presence of some Malware on your PC. The first thing that you should do is to scan your PC for Malware. Sometimes, the malware files present in our PC shut down the Windows Defender and that causes the Windows Defender error 577 in windows 10. You can fix this issue by scanning your PC using some anti-malware utility.

Turn ON the Windows Defender’s real-time protection:

Turning ON the real-time protection have solved this issue for several users. You can try this fix by following the steps mentioned below:

  1. Open Settings on your PC.
  2. Select Update & Security from the list of options.
  3. Click on Windows Defender from there.
  4. From the new window, turn ON the button to enable real-time protection.

Get rid of the third-party anti-malware program:

Many times, the Windows Defender error 577 in windows 10 has occurred to the users who have installed some third-party anti-virus software on their PC. You can uninstall the software by following the steps mentioned below:

  1. Open Settings on your PC.
  2. Select Programs from the list of options then, click on Programs and Features.
  3. Then, a list of options will appear on the screen. From that list, right-click on the software that you want to uninstall and then click on the Uninstall

Restore the corrupted files:

You can face the Windows Defender error 577 in windows 10 because some of the files in your PC have been corrupted. You can fix this issue by running System File Checker on your PC:

  1. Open Command Prompt on your PC. (you can do it by pressing Windows + R and then, type cmd in the Run Utility Box).
  2. In the command prompt, type sfc/scannow and hit
  3. The execution of this process will last for some time. Wait for this process to be completed.
  4. In case, you are unable to restore files then, type the following command: dism/Online/Cleanup-image/RestoreHealth and then press Enter. (your PC should be connected to the Internet before executing this command).
  5. After the execution of this command, repeat the step ‘c’.

Start Security Center on your PC:

Sometimes the Windows Defender error 577 in windows 10 is caused because we have not started the Start Security Center on our PC properly. You can do it by following the steps mentioned below:

  1. Open the Run Utility Box on your PC. (You can do it by pressing Windows + R on your keyboard).
  2. Type msc in the field provided then hit Enter.
  3. In the list of services, find the service named Security Center.
  4. Right-click on this option and then select on Restart.

Restore your system to an earlier state:

Many times some problems can of our PC can be resolved by restoring our PC to the earlier state when our PC was in a good state. By restoring the system to an earlier state, you can revert the changes made by several software on your PC. You can do it by following the steps mentioned below:

  1. Open Control Panel on your PC (you can do it by typing Control Panel in the search area at the bottom-left corner of the screen).
  2. Click on the option Recovery then select System Restore from the new window.
  3. Select the System Protection
  4. At last, click on the button System Restore.

Make some changes in the registry of your Windows:

Many users have faced the Windows Defender error 577 in windows 10 because there was something wrong with the security permissions for some keys in the Windows Registry. Follow the steps mentioned below to make these changes:

  1. Open the Registry Editor. (to do it, press Start + R then type regedit in the utility box)
  2. Navigate to the following path: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender
  3. Right-click on this key and select Permissions from the context menu.
  4. Click on the Advanced button and then Add
  5. From the new window, click on Select a principal.
  6. Select Check Names from the field type Enter the Object Name to select.
  7. At last, click on the button OK to finish this process.
  8. Then check the box before the option Full Control and click OK.
  9. Select the box beside Enable Inheritance
  10. At last, click on the option Apply and then OK.

You can make some additional changes in the registry of the Windows to solve your Windows Defender error 577. Sometimes, our defender is interrupted by some malware in our PC. Follow the steps mentioned below to make these changes:

  • Open the registry editor on your PC.
  • Once in the registry editor, follow the steps mentioned below to create a registry backup:
    1. Click on the option File then Export.
    2. Type a file name and then under the Export Range, select
    3. After doing this, choose a location to save this file and then click on Save.
  • From the left panel, click on HKEY_LOCAL_MACHINE_SOFTWARE to expand this key. From the expanded list, select Microsoft.
  • On the right-panel, double-click on the option Disable Antivirus and then, change the value data to 0. Do the same for the Anti-Spyware key.

In this article, we have mentioned every possible solution to your problem of Windows Defender error 577 in windows 10. In case, you are unable to solve your problem even after trying all the solutions mentioned above, you can contact us through our website and the other contact details provided below. We have got a team of experts to solve all your issues related to PCs and  phones.

Website: www.itsneb.com

Contact: +1(866)235-4333

Ujjwal Abhishek