adam37 speaks truths, I have been using this method all day on computers at work. Actually I use the second method of just doing the factory wipe; adam37 says to use acetone but in my experience, strong bases such as bleach seem to work best for cleaning the virus off the drive, then using steel wool to get a nice shine on the platters and you should be good to go, just make sure you remove any steel shavings before putting the drive back together. Also an easier way to get the static back in the ram after the hard disk clean would be to simply throw the ram sticks in the dryer with a load of towels (and no dryer sheet) as this helps build up the necessary static that your ram needs.
Hope this helps!