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How to Repair registry in Windows

1) Boot up system from XP installation CD

2) In System Recovery Console command line

3) Switch to registry hive backup folder:
Run "cd c:\windows\system32\config\regback"
You will see old registry hive files with .old extension

4) Rename the currently used registry hives:
Run "cd .." to switch to upper level folder c:\windows\system32\config
Run "ren components components.bak"
Run "ren default default.bak"
Run "ren security security.bak"
Run "ren software software.bak"
Run "ren system system.bak"

5) Copy old registry hives to replace the current one:
Run "cd regback" to switch to c:\windows\system32\config\regback,
Run "copy *.old c:\windows\system32\config"
Run "ren components.old components"
Run "ren default.old default"
Run "ren security.old security"
Run "ren software.old software"
Run "ren system.old system"

6) Reboot system.

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