back everything you need up
format C:
install you choice of os
the image the drive to another partition or hdd.
Whenever it gets junky again, if virii scanners or spyware software cannot fix it, wipe it and restore that image. I do it all the time...Just somethin to think about if you decide to wipe it eventually

1xAxiom ax 1.2 2xPolk Audio R30 2xMordaunt-Short 3.0 H/K AVR 225 Paradigm PDR-10 Sub HTR MX-500