If you’re preparing to reinstall Windows Vista you’ll need to locate your copy of the Windows Vista product key. Normally this product key is on a sticker on your computer or located with the Windows Vista product manual.
If you’ve lost your product key, it’s located in the registry but is encrypted and not readable, making finding it difficult. The key was not encrypted in previous versions of Windows like Windows 98.
Follow the steps below to locate your Windows Vista product key code.
Time Required: Less than 15 minutes
souece and more:http://pcsupport.about.com/od/tipstricks/ht/findvistakey.htm