Hi Colin,

If you have a Retail or Express Vista installation DVD and the product key number 
for it, then you can install it on another computer since it no longer available 
on the other computer. You will most likely need to do a phone activation to let 
MS know that it is not being install on more than one computer. This tutorial will 
show you how to do a phone activation if needed.

http://www.vistax64.com/tutorials/84488-activate-vista-phone.html

Hope this helps,
Shawn
There are no dumb questions, just the people that do not ask them.

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