Until yesterday it was only possible to download the 32-bit client version of the release candidate 1 of Windows Vista. Yesterday Microsoft added the Vista 64-bit client to the download list which can be downloaded through your browser by either using a direct download or Microsofts download manager. As usual this version is time limited and will stop working on June, 1st 2007. You will also need a product key for vista, I wrote a little article detailing the procedure to receive one.
Microsoft added another service to their vista customer preview program – shipping vista right to your doorstep. This service costs about 10$ depending on the country you are currently living in. This could be a good way to receive a vista client if you have a slow internet connection. (client is about 3,5 gigabytes.)
Microsoft does not have a special changelog for the 64-client on their website, I assume the same changelog as for the 32-bit client is valid.
What’s left to say ? I suggest you give it a shot if you would like to experience the new features of windows vista. I personally will not download and install the new operating system because I think it poses a big threat that users will no longer be fully under control. With all the updated wga and drm features vista poses this threat. As I said earlier, I will make the change to Linux once I assembled my new computer.

Download Windows Vista Service Pack 1 Beta
Download Windows Vista SP1 Beta through Windows Update again
EXCUSE ME!
MAY I HAVE A WINDOWS VISTA PRODUCT KEY??
HOW CAN I GET ?
AND WHERE THE KEY CAN BE FIND?
look here http://www.ghacks.net/2006/09/14/how-to-get-an-product-key-for-vista-rc1/
hepl me