XP 64bit and Vista 64bit questions

> I've got one computer to migrate to Vista Business 32-bit and one to
> migrate to either XP Pro 64-bit or Vista Business 64-bit, but the
> questions involve both platforms. One computer is a 32-bit computer
> running XPPro, with it's printers shared out to a (second) 64-bit computer
> running XP Home 32-bit at the moment. The first is upgrading to Vista
> Business 32-bit, and the second one is going to upgrade to either XP Pro
> 64-bit or Vista Business 64-bit.
>
> Will the computer ending up at Vista Business 32-bit have issues after the
> upgrade sharing printer drivers with the 64-bit computer, or do I need to
> do separate driver installations for both printers (assuming I get printer
> drivers for Vista Business and XPPro 64-bit for both printers)? I would
> assume that printer drivers if both machines end up at Vista Business will
> be simpler.
>
> What wireless cards are available that run under Vista Business or Vista
> Business 64-bit? What wireless cards are available that run under XP Pro
> 64-bit?
>
> Will the 64-bit machine show any performance improvement in running Doom 3
> and Quake 4 <g>? It comes with 2 gigs of RAM and a 512-meg ATI Radeon
> X1300 card in an AGP slot, and ATI just released 64-bit drivers for the
> card. The motheboard manufacturer has also just released 64-bit drivers
> for XP Pro and for Vista.
>
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