I have an old HP computer that I need to completely erase. I picked up the Vundo virus awhile back and I couldn't delete it but I was able to suppress all the pop-ups. Anyway, when I click on sytem restore, it tells me to restart the computer and try again. I did that and it just keeps giving me the same message. Is there another way to erase the hard drive completely? The system restore would erase everything and bring it back to it's factory settings but unfortunately it won't let me do it.