Windows system32 config system is corrupt in Windows Server 2003

1. Insert your Windows Server 2003 CD and reboot from the CD drive

[To boot from CD, go to BIOS Setup option on startup and select your CD/DVD drive as the first boot drive, save the present settings and exit]
Your computer will reboot & will boot from Windows Server 2003
2. Press ‘R’ when offered the option of using the Windows Recovery Console
Recovery Console will prompt at the command prompt type the following:
C:\WINDOWS >cd system32\
this changes the current directory to C:\Windows\System32
ren config configold
This renames the config folder to configold
mkdir config
this makes a new directory called config
cd config
changes the current directory to c:\Windows\System32\Config
then type the following lines pressing enter after each one
copy c:\windows\repair\system
copy c:\windows\repair\software
copy c:\windows\repair\sam
copy c:\windows\repair\security
copy c:windows\repair\default
after each line it should say:
1 file copied
type: exit
Now Server will reboot

[To boot from Hard Drive, go to BIOS Setup option on startup and select your Hard drive as the first boot drive, save the present 

Courtesy:satirur.