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 they can’t turn on Windows Defender because Microsoft’s antimalware tool detects another antivirus software running.
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