Problem: XP Repair instructions from http://www.michaelst...pairinstall.htm were fine until I got to the cd-key menu. I tried using the cd-key I had originally used to install the OS on the comp and several other valid keys. All of them were found to be invalid. With nothing I could do and stuck at the cd-key screen, I tried rebooting the computer (Since the OS had been previously installed and now the missing files fixed, I thought all was well). Now whenever I start the computer I will see the blue screen of windows installation with the words "Setup is being restarted ..." and the computer will then proceed to a black screen where I can move my mouse, an error message appears and disappears in a split second (tried to videotape and slow down, but it was too fast), then the computer reboots and everything happens again.