Stop, unless you are pondus or a removal EXPERT on this forums you shouldnt be giving advice. I have permisson from Pondus to aid about directions however I Believe you do not. Not trying to be mean.
Run the ordered logs so someone can check you computer.
Adwcleaner/MBAM/OTL/AswMBR
Link: http://forum.avast.com/index.php?topic=53253.0
If the tools crash your crashes your computer you need to run them in safe mode. And the tools are safe, someimes the AV(s) might interfere
Again, even though sfc /scannow and chkdsk are able to fix issues given he has tried reinstalling the drivers I dont think thats the issue. The post is not to offend you.