Join Date: Feb 2008
Location: Toronto Downtown, Bell VDSL Fibe
The OP states that he suspects his existing hard drive has a virus. To be safe, he should be unplugging that drive from the power (the smaller plug that fits in) and installing windows from a source other than his hard drive. He'll need a Windows CD, which may complicate matters if he does not have original media. He'd then want to wipe the existing hard drive.
I'd suggest focusing on getting rid of the virus first, before proceeding as ExDilbert suggests. Side benefit of not losing his existing data etc on the existing hard drive.
Former Rogers VIP, now Bell Fibe, Sony KDL40W3000, BDPS350, Philips Streamium NP2500 (2). DS209 NAS, Playbook