There is a page from Microsoft TechNet containing a list of 7 generic product keys for Windows XP and Whistler.

Lots of websites and software sellers cheat people by telling them that these are genuine XP product keys and can be used to activate Windows without any problem.
They even ask for money to provide these keys but the worst thing is the keys are blacklisted at Microsoft and you'll not be able to use them to activate your Windows. Although you can use the keys to install Windows for approx. 14 days.
So don't believe anyone who claims to provide these keys. Purchase a genuine license and enjoy it.
Microsoft provided these keys to teach how to deploy Windows XP using Windows Product Activation (WPA):
Even Microsoft has clearly mentioned about these product keys:
The product keys listed in this section can be used with any of the answer files and scripted examples. They are blocked at the Microsoft clearinghouse and therefore cannot be used to activate any systems. They provide a number of days (assume 14 days) for you to complete the activation process.
So don't believe anyone providing these blocked keys, don't waste your money on these blocked keys and buy a genuine Windows license from Microsoft.
This article was posted by VG in following section: Windows XP.
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MANOJIT
THANKS FOR THE VERY IMPORTANT INFORMATION . MY FRIEND HAD FACED THIS PROBLEM ALSO . THANKS AGAIN FOR SUPPORTING ANTI PIRACY CAMPAIGN .
WISH YOU A GOOD LUCK.
Jeet Chowdhury
what is corporate key. is this not need to activate?
VG
^^ There is no corporate key. Its a term used by pirates.
Jeet Chowdhury
one of my frnd using a corporate key and it show his pc is genuine.
Ingnition
Wow
rabbi hossain
mannnnnnnnnnnnnnnnnnnnnnnyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy thanks to you
sam
Um..Actually there is such a thing called a cooperate key..It is actually meant for companies to mass install windows on their coms..and thus the key they use ..one same single key..can be used over and over again...
unfortunately...most cooperate keys have a limitation..other than a few special ones..
Other than tat..OEM keys work too..oem keys can be reused....But most effective on the pc meant for the oem..for example HP,,
clydeman
So if I wanted to reinstall Windows I can use the above keys?