I have just bought a new i7 CPU based PC, with Win7 64bit installed.
I logged on to the PI download site, and downloaded the 64bit Win 7 version of PI V7.
However, when I enter my 'user identifier' and Windows OS 'activation code (as I used on my Win XP 32bit PC) the PI server rejects it, and hence I can't activate the software.

I'm guessing that perhaps I need a different 'activation code' for the 64bit version?
Dave