Hmm.......
I would reformat and reinstall Windows. Just my nickle. Additionaly i would purchase a program like Acronis.
You use the program to make an true image file of your hard drive and if something goes bad
you bring it back in a short time frame. Additionaly, format your hard drive so on one of the partitions the only thing you have there is the operating system. Can replace that in 5 minutes or so.
FWIW,
RICH