system
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Adding a new experience to this topic.
Using an HP laptop, nearly no custom software, Win7 + Avast was working fine. Upgraded to Windows10 and start menu and every win10 app would not open. I tried the restart to safe mode, verify files with sfc and powershell methods, nothing fixed it permanently (it would work for a day and stop again). Uninstalling Avast fixed it for good. Re-installing Avast the problem came back. So, sorry, but this anti-virus is getting removed permanently.