Alright so I got a computer from a friend of the family, hp pavillion 7966. They just cleaned the system so it didnt have windows xp...Accidently I stuck in the Windows XP Home Edition UPGRADE it started downloading and then told me to enter the original windows xp. I didnt have it at the time so I canceled the download and drove off to get it. Now when I turned the computer back on I get the hp pavillion load up screen and then just a plain black screen. Is there any way I would be able to get back to the Failure to boot screen and then stick in the windows xp and restart the download? what should I do?