get important files on a cd ...
1) format the pc as virus or spyware dont go away eaisly ..
install new windows .. but dont insert your cd without installing anti virus
2) if u have more than 1 partition, copy important data anywhere except c:, format c: , install new windows .. install anti virus .. check old data probably not in c:,
dont run any file without virus checking it ....
if problem presists ... panic !!!