I'm trying to restore an old HP pavilion Dv6 to factory state. The recovery image on hard drive is not working. I lost disc one of the three disc system recovery discs I made so there no good. I tried recovery discs from another computer but computer says they are not for that computer and will not work. I downloaded a new image to a usb drive. When I try to use the usb image from HP it says system restore discs have already been created and makes me cancel the process. Can I override or reset something so the USB image will work? how can restore windows 7 with no discs and original D: messed up?