How to Reset Windows XP Registry to Defaultby Brendan O'Brien
Your Windows XP operating system computer is driven by the registry, which is a large set of files and folders full of complex settings. If you make an error in the registry or inadvertently delete a file, you can restore the registry's original default settings.
Click the "Start" button in the lower-left corner of your desktop. Scroll up and click "Run."
Type "%SystemRoot%\System32\Restore\Rstrui.exe" (without the quotes) in the field and press the "OK" button.
Press the "Restore my computer to an earlier time" choice and then click the "Next" button.
Select "System checkpoint" and then click "Guided Help (Registry Backup)." Click the "Next" button and then click the "OK" button if a confirmation window appears.
Click the "Next" button and wait for the restoration to complete. The system will restart itself.
Click the "OK" button on the "System Restore" page.
- computer image by blaine stiger from Fotolia.com