When I start my computer, I get error message

"Windows\System32\config\system" file missing or corrupt

Solution::
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


Win XP Tweaks

STARTUP

Article Source:- http://www.tricksystem.com/