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I've had no game related problems with Vista 64 (network compatibility issues on the other hand...). If you're installing more than 3GB of RAM, there's really no reason not to use Windows 7 64 as it is the direction everything will be heading sooner than later due to the memory ceiling of 32bit systems.

The only problems you might run into are older peripherals (pre Vista) and applications that are no longer being supported with updates. On a brand new build or even one made in the last two (Intel Core 2 Duo generation onward), I see no reason to stay restricted to 3GB of usable system memory.

Plus from my understanding, both 32 and 64 bit versions are on the Win 7 installer disc. At least I hope so since I've already ordered a copy and there was no selection available for either 32 or 64 bit versions.