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How to restore Windows XP to a previous state
Describes how to use System Restore to restore your computer to a previous configuration and how to undo the restoration if it reverts your system to a configuration that you do not want.
How to recover from a corrupted registry that prevents Windows XP from starting
This article describes how to recover a Windows XP system that does not start because of corruption in the registry. This procedure does not guarantee full recovery of the system to a previous state; however, you should be able to recover data when you...
How to back up and restore the registry in Windows XP
Explains how to back up the registry in case something goes wrong when you edit the registry and you must restore the registry.
Repair & recovery - Microsoft Windows Help
Get help with repair and recovery, including info about file recovery, PC reset or refresh, system diagnostic tools, and safe mode.
no disk, only a product key to attempt system repair/recovery: how?
How can I repair/recover my Windows XP Pro HP when I have no disk? Asking from laptop, problem is desktop.