Windows 10 windows defender won t turn on

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These issues include conflicts between antivirus software that can manifest as frequent freezing, crashing to applications, etc. Windows is designed to detect any installed antivirus software, and certain issues can occur if you have two or more antivirus software installed. Windows Defender is designed to turn itself off if it detects any other third-party antivirus software. What to do if Windows Defender won’t turn on in Windows 10:

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I'm Greg, an installation specialist and 8 year Windows MVP, here to help you.

 

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