Windows Defender is a well-known antivirus software developed by Microsoft. It is pre-installed on all Windows computers to fight against potential virus threats. You can use Windows Defender even for scanning your emails. In case you are getting the Windows Defender error 577, then your computer is under a security risk. Keep reading the troubleshooting steps below to fix the Windows Defender error 577 on your computer.
Solution 1: Change your registry
Step 1:On your Windows computer, open the Run command by pressing Windows + R.
Step 2:Type ‘regedit’ in the Run dialog box and hit the Enter key to open the Registry Editor.
Step 3:Go to the HKEY_LOCAL_MACHINESOFTWARE Microsoft Windows Defender file path.
Step 4:Give a right-click on Disable AntiSpyware and change the Value data from 0 to 1.
Step 5:Repeat the same for DisableAntiVirus.
Step 6:Close the Registry Editor and open File Explorer.
Step 7:Go to the file path C:\Program Files\Windows Defender and run MSASCui.exe.
Step 8:This will fix the Windows Defender error 577.
Solution 2: Remove third-party antivirus
Step 1:To begin with, open Control Panel and click on the Uninstall a program link below Programs.
Step 2:Now, you can view a list of programs installed on your computer.
Step 3:Locate the third-party antivirus software and their related files from the displayed list.
Step 4:Click the Uninstall button at the top of the page to remove all the selected programs from your computer.
Step 5:If prompted, click Uninstall or Remove to confirm your action.
Step 6:Once you have removed all the third-party antivirus programs, restart your computer.
Step 7:Check if the Windows Defender error 577 reappears. If so, move on to the next solution.
Solution 3: Restart Windows Defender and Security Center service
Step 1:On your computer, open Windows Services.
Step 2:Locate the Security Center service from the displayed list. Give a right-click on it and select Restart.
Step 3:Next, locate and right-click the Windows Defender service. Select the Start option from the pop-up menu.
Step 4:Restart your computer and check if the problems with Windows Defender have been resolved.
Step 5:If you get the Windows Defender error 577 again, disable and enable Windows Defender on your computer.