When I start my computer, I get error message: Windows\System32\config\system" file missing or corrupt

Boot using Windows Setup CD and enter into "Recovery Console" by pressing "R". Now Log into windows installation and enter admin password. Now give following commands at prompt:

copy %windir%\Repair\system %windir%\System32\Config

If it doesnt work, then again boot into "Recovery Console" and give following commands:

fixmbr
bootcfg /scan
bootcfg /rebuild
fixboot