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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)

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More here: superuser.com/questions/43196/… – hyperslug Sep 24 '09 at 4:26
And here superuser.com/questions/32367/… – hyperslug Sep 24 '09 at 4:27
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closed as exact duplicate by hyperslug, Jeff Atwood♦ Sep 24 '09 at 4:44

This question covers exactly the same ground as earlier questions on this topic; its answers may be merged with another identical question. See the FAQ for guidance on how to improve it.

2 Answers

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

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up vote 0 down vote

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

WinKeyFinder:

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Keyfinder Thing:

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LicenseCrawler:

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