Yes, just reformat the hard drive. It will wipe it and then you can reinstall the Operating System. You just have to actually have the Operating System disk still. That will take off any spyware, viruses, etc... It will not fix any possible hardware issues though.
The 2014 Hit Squad (FFL)
Eddie Alvarez - Junior Dos Santos - Patricio Freire - Jessica Eye - Pat Curran
Sig Credit: M.C