If you need extra time before activating you can extend the 30 day
trial period with a simple command line instruction.
See "Extending The Windows Vista Grace Period to 120 Days" at
http://www.codinghorror.com/blog/archives/000778.html
Note that << simply start a command prompt as Administrator, >> is
critical and for me the easy way is to navigate through START /
Programs / Accessories / Command Prompt and right mouse click on that
last menu item Command Prompt and select Run as Administrator.
BTW THose directions on how to get to Command Prompt and run it as an
adminsitrator are from the Classic menu structure that you can select
if you right mouse click on the START button, select Properties and
then change to Classic Menu -- I don't know how you do it with the
VISTA menu structure! There must be a way .....