I grabbed this from :
http://www.tweakvista.com/article39026.aspx
>>
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"
>>
--
Dustin Harper
(E-Mail Removed)
http://www.vistarip.com | Vista Resource & Information Page
"bls8195" <(E-Mail Removed)> wrote in message
news:23C2A4E1-0F7D-4CAA-B23F-(E-Mail Removed)...
>I bought 2 copies for 2 computers of Vista. I put the same license key for
> both, by mistake, and they both registered, how do I go back in and change
> one?