IIRC., from the 'official' boards - 32-bit Vista? Yes. 64-bit *anything*? No. Note that Vista is unusual in that it's the first Microsoft OS that (in nearly all editions) comes with both the 32-bit and 64-bit DVD in the box. Make sure you pick the right one!
(IIRC., the most entry-level offering does not have the 64-bit option, though.)
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