I'll let someone with more computer knowledge elaborate, because my google searching skills are not strong this early in the morning.
This is not true; the key will work. (maybe you just made a typo) The key is specific to the edition of Windows (Home, Pro, Ultimate). The architecture isn't treated as an edition.32-bit product keys won't work with 64-bit.
Crapola. I was thinking of the editions.This is not true; the key will work.
N64 kicks ass.