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Avast boot time scan keep showing every time when booting windows 10

I had odd issues with Avast when I did an upgrade to windows 10, it's something funky in Windows... how I ended up fixing it is to do a fresh install of Windows 10 and then install the antivirus, and the oddness stopped.
But I only tested it for about 2 weeks before I went back to windows 7 because windows 10 bothered me.