There is still only very limited support for 64-bit Vista, and where it is supported the software is not yet that mature. You shouldn't have anywhere near as many problems with 32-bit Vista as nearly every manufacturer now has Vista compatible drivers and code for current versions of software and hardware.
Unless you absolutely must have a 64-bit OS for some reason, stick with 32-bit for the time-being, whether that be Vista or XP.
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