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Change Windows Vista Product Key
http://www.vistaarticles.com/articles/182/1/Change-Windows-Vista-Product-Key
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Published on 12/9/2006
 
Change your Windows Vista product key after installing.

Change Windows Vista Product Key

1. Click on the Start Button and key in command prompt so that it shows up on your start menu search list. Right click on the Command Prompt shortcut and select Run As Administrator.

2. At the administrator command prompt, type in "slmgr.vbs -ipk <insert your product key here>"

3. To activate windows after changing the key, run "slmgr.vbs -ato"