C:\windows\system32\config\system missing or corrupt

If you turn on your computer and find an error message that says:
Windows could not start because the following file is missing or corrupt
C:\windows\system32\config\system
Or C:\windows\system32\config\software

You can attempt to repair this file by doing this step :

1. Boot from your CD Windows XP

2. Select "r" at the first screen to start repair

3. Type number 1 (C:\Windows) and press enter

4. If you are asked password administrator, fill in or if you don’t have, just press enter

5. Type cd\windows\system32\config

6. Depend on corrupt\missing section :
- if system, type: ren system system.bad
- if software, type: ren software software.bad

7. Then depend on corrupt\missing section :
- if system, type: copy \windows\repair\system
- if software, type: copy \windows\repair\software

8. Remove CD and type "EXIT" then press ENTER (to reboot your computer).