why won t my product keys work

I have just downloaded Vista via the links provided by the email sent to my from service@microsoft.com.
Unfortunately, when it comes to entering them into the installer, I get "Setup cannot validate your product key .....", I have double checked the digits, copied and pasted them from the email, but I still get the error.
I have even obtained another product key, via my secondary hotmail account. But that doesn't work also.
I will re-iterate that this is the legally downloaded version of the CPP Vista Beta 2, and I am trying to use legally obtained product keys.

I just retyped the product key again like it was a new one and it worked so go toa activationscreen try to activate this wil fail and go to the option fil in new product key and use the frist one you had it worked on mine
"Terranaut" wrote in message

I have just downloaded Vista via the links provided by the email sent to my from service@microsoft.com.
Unfortunately, when it comes to entering them into the installer, I get "Setup cannot validate your product key .....", I have double checked the digits, copied and pasted them from the email, but I still get the error.
I have even obtained another product key, via my secondary hotmail account. But that doesn't work also.
I will re-iterate that this is the legally downloaded version of the CPP Vista Beta 2, and I am trying to use legally obtained product keys.