Windows 8.1 upgrade, your antivirus vs Defender


SatelliteGuys Pro
Oct 27, 2006
Southern Maine
I upgraded to windows 8.1. I got an error message today. Something about avast not starting and defender taking over.

After some research I found out that Windows 8 comes with Defender. Windows 8 defender is not just for malware, it is also an antivirus. When you install an antivirus windows disables defender.

I ran the avast cleanup tool and then reinstalled avast. I had some performance issues until I restarted my computer after installing avast. I'm guessing the restart disabled defender. If anyone else runs into issues I can go into more detail.

Are you having issues with your antivirus after an upgrade to Windows 8.1?

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