Possible Duplicate:
Best way to retrieve license information

The kid's computer is infested with viruses, and I want to wipe it clean and reinstall XP. I can't find the XP CD and box with the key sticker anymore. I have an installation CD from MSDN but for correctness reasons would like to use the original personal license. Is there a way to find out the activation key for the currently installed instance?

Control Panels -> System shows registered to, with a registration number, but it doesn't look like an installation key (i.e. it's only digits, not alphanumeric)


You can use the (open source!) Magical Jelly Bean Keyfinder.


Jelly Bean is probably the most popular. Here's some alternatives though:


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Keyfinder Thing:

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