@ the ghost,
I run windows 8.1 with the latest updates and avast! on several computers both 32 and 64 bit versions.
As you can see, I don’t have any of the problems your describing.
It sounds like there’s something else running that’s causing a conflict.
http://www.screencast-o-matic.com/screenshots/u/Lh/1407149534215-53086.png