This is what I would try.
Perform a full Window Update
Run "devmgmt.msc" and find your graphics card then right cllick and update
Download and run the following adwcleaner, rkill and JRT to clean your system. If you have windows 7 run combofix as well (if you want the links then let me know) and try superantispyware
also run from the command prompt "sfc /scannow" then reboot.
Can you also empty "c:\temp" and "C:\windows\system32\temp"
and then reboot and try again and report back