Vista64 - Reactivate? Need help

It has only been a couple hours that I have been playing with Vista 64 on this new PC, but I am nearly ready to trash it. I have NOT added any new hardware. I have only added some programs and now Vista tells me I need to reactivate and buy another CD Key.

I typed in the original key and that is not valid because it is already in use - yeah by me....I entered in into the system yesterday.

What the heck can I do to get this bloody thing working? Oh I almost wish I just went with Vistax86 or even another copy of Wn XP pro.

You will just have to get it reactivated over the phone, its very easy and only takes about 5mins