• Rollback the XP Registry
  Straightforward manual XP system restore guide
  with manual registry restore roll-back system windows xp by 2 users
• Create A System Restore Point
  Small executable that creates a SysResPoint for XP
  with system:unfiled
• How to: Manually restore the system registry for Windows XP (Google cache)
  Copy the following files from the folder (hidden folder named something like: _restore{C6E9847C-AEF5-4523-BE1B-5E7A365553E6}): _REGISTRY_USER_.DEFAULT _REGISTRY_MACHINE_SECURITY _REGISTRY_MACHINE_SOFTWARE _REGISTRY_MACHINE_SYSTEM _REGISTRY_MACHINE_SAM Browse to \Windows\System32\config in the corrupted HDD. Paste the files in this folder. Now rename the files to: DEFAULT SECURITY SOFTWARE SYSTEM SAM
  with computer manual restore system xp

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