In addition, be sure to remove all files and registry entries associated with your antivirus. If that’s the case, remove all third-party antivirus tools from your PC.

Windows Defender won’t open – Many users claim that Windows Defender won’t open on their PC.

Can’t turn on Windows Defender Windows 8 – This problem can also appear on Windows 8, but you should be able to fix it using one of our solutions.

Speaking of problems, these are some of the common issues that users reported: However, many users reported that Windows Defender doesn’t work on their PC. Windows Defender is a built-in antivirus in Windows 10, and it provides solid protection for the most part. This isn’t the first time users have reported they can’t turn on Windows Defender, although we noticed an increased number of reports. This happens even though users confirm they have uninstalled all third-party security software. Many Windows 10 users are reporting that Windows Defender is not opening because Microsoft’s antimalware tool detects another antivirus software running.

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Windows defender windows 11 not working