Could you please provide us with more information about your system.
Particularly what version of Windows 8 are you running? Is it 64 bit?
What scans did you perform? To troubleshoot this, I need more information. The problem could just be with some functionality in windows 8 and the software. I should be able diagnose the problem and get your system back to how it was before if I can get more information about the issues you are having.