It's usually some Fkey on startup (check your documentation.) While I do have downloadable Windows 7 repair DVDs the problem is they may burn you on the factory restore feature.
Bob
I was returning my Acer laptop to Windows 7 factory default, when the PC froze ith 5:21 remaining until process was to b completed. The PC rebooted and all that came up was "windows\system32\config\system." It went on to say "A file may be missing or corrupt" I don't have the recovery or Windows Installation disks with me. I can't even reach "Repair your computer" without it going to the windows\system32\config\system message coming up. I have access to a 2nd PC, USB drives, and DVD ISO burner. Any help greatly appreciated.
Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic