Viruses can have that effect on your system. I just repaired a computer that
had it's AV software disabled and would not allow any system restores. To
make things worse it even disallowed most AV/spyware/worm/malware software
from even starting. I did eventally get a foot hold then remove all
infections but it does take time. You can remove your HD then use it in a
USB or as a slave drive then run MANY av/malware/spyware packages to get a
handle on getting these infections off your computer. here is more info in
case you decise to go that route
http://www.randem.com/virusproblems.html
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Randem Systems
Your Installation Specialist
The Top Inno Setup Script Generator
http://www.randem.com/innoscript.html
Disk Read Error Press Ctl+Alt+Del to Restart
http://www.randem.com/discus/messages/9402/9406.html?1236319938