When I start my computer, I get error message

When I start my computer, I get error message:"Windows\System32\config\system" file missing or corruptSolution::1. 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\Config2.If it doesnt work, then again boot into "Recovery