System scan makes Avast crash.

Hello!

I’ve experienced that my computer was running slowly so I figured I’d run a scan.

When I start a full system scan Avast just stops responding and won’t continue. This is really frustating, so I tried uninstall and reinstall Avast, but it’s still not fucking working!
I also realized that it started to run slow as soon as the latest update was applied. I want my computer to run and run smooth!

I am running Avast on Win 8.1 64bit

I've experienced that my computer was running slowly so I figured I'd run a scan.
have you tried a malwarebytes scan ? ..... your comp may be full of PUP

if you still have a problem, see instructions here https://forum.avast.com/index.php?topic=53253.0
scroll down to second picture Farbar Recovery Scan Tool run as instructed and attach the two diagnostic logs