there was a bug in vista 64bit (not 32bit, or maybe ALSO 32bit) RTM that if you had 4GB during installing you would have BSOD. It was quickly fixed, but you had to install with 2GB, update using windows update, and then put in the 4GB of ram.
Like every MS os before or after, the original release is full of bugs. SP1 fixes all the major issues and is solid enough to use. Just make sure you install from an SP1 disk.
creative drives are the worst in the entire industry, I will never use a creative card again. (well, unless they magically start making good drivers, which I don't see happening). Which is a shame cause they make the best hardware. their name "creative labs" is appropriate, they are a lab that makes impressive hardware, not a quality products.
Anyways there is nothing "special" about vista or 64bit drivers. Every piece of hardware always needed drivers to work, and drivers had to be rewritten for almost every single MS OS.
It should be pointing out that manufacturers are dropping support for windows XP now, latest nvidia drivers for example are only available for vista 32 and vista 64bit.