on booting up my computer, it wouldn't let me into the log screen. it said something about s.m.a.r.t. disk bad, backup + replace + that some files were missing. so i got a loan of a windows xp disk + tried to boot from disk,when i tried to copy them from the disk to my drive i couldnt. so i deleted the partition + formatted the drive, then booted from disk again. it asked me to enter a (coa) product key, but the key i entered does not match the one to go with the disk. it still worked and am writing this message from my pc, but when i try to validate windows using the same key it doesnt work. i cant get the key that came with the disk as the person doesnt have it...any suggestions would be much appreciated....thank you