|From your explanation I doubt this is a virus. More likely that something is corrupting the data on the hard disk. It is unusual to have two hard disk failures in such a short time and I'm unsure what evidence you had for the HD being the culprit again (assuming it was in the first place).|
My guess is it is hardware or it's connections, most likely RAM. Download a RAM test and see if it finds anything.
Always pop back and let us know the outcome - thanks
message edited by Derek