About a week I had a problem that very often my computer restarted just by itself! But that wasn't all! I just tolerated this problem because sometimes it happened very rarely about a one time in hour. But one day the computer restarted and a error appeared:

Windows could not start because the following file is missing or corupt
:\WINDOWS\SYSTEM32\CONFIG\SYSTEM


Maybe you know the fastest and best way to repair this! What could be the problem? Help is needed from you all guys and computer specs!

Here is the official page on that error:

http://support.microsoft.com/kb/307545