When running Win10 on my laptop, using any security software, Avast!, Win Defender, causes constant 100% disk usage. As soon as I turn off RTS with Defender, it jumps down to 0. This isn't my main PC, do I need an antivirus if I only download from reputable sites? And any ideas how to fix this? I'm doing an SFC scan right now.

  • Yes, you need AV, because drive-by downloads and “malvertising”. – Daniel B Dec 21 '16 at 21:38
  • Any recommendations for low disk usage AVs then? Since it seems either I'm having an issue with them, or this laptop can't handle even Defender. – Tom Barrett Dec 21 '16 at 21:39
  • Windows Defender, by itself, does only on-access scanning. So something else is accessing files. – Daniel B Dec 21 '16 at 21:41
  • As soon as I disabled RTS, disk usage dropped from 100 to 0 instantly. Something that is linked to it? I'll re-enable and look in resource monitor – Tom Barrett Dec 21 '16 at 21:43
  • soon as SFC is over that is – Tom Barrett Dec 21 '16 at 21:44

You should not run two anti-malware applications simultaneously as they will interfere with each other (though you can do a one-time scan of specific files with a second tool, such as Malwarebytes) . Avast! should have disabled the Windows Defender engine. If it did not, uninstall Avast! and then reinstall it.

Though Avast! is an excellent tool, you might try Avira or other free AV suite if you still experience the issue.

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