Boot from the DVD and start the installation
Select the Language, Time and Currency, and Keyboard
Click on Next
Click on Install Now
Don't enter a Product Key
Uncheck Automatically activate Windows when I'm online
Click on Next
Click on No to confirm you do not want to enter a product key
Highlight the version of Vista you want to install
Check that it is the same edition you have purchased (if you want to enter in a product key at a later time).
Click on Next
Check accept the license and terms
Click on Next
Install a clean copy and continue as with a regular install.
Source:- http://vista-basic.blogspot.com/
