Hi giffoj, I believe that is only macs that are 64 bit only for photoshop cs6, as windows still has a 32 and 64 bit version of photoshop cs6. But if one is installing photoshop cs6 on a windows 32 bit operating system, the installer just installs the 32 bit version of photoshop cs6 without any user intervention. As far as windows vista, even though photoshop cs6 is not officially supported it should work fine on both vista 32 and 64 bit systems. Adobe does offer a 30 day trial of photoshop cs6 if you wish to try it out before buying. On a 64 bit windows system the installer installs both the 32 and 64 bit versions of photoshop cs6 unless one only chooses the 64 bit install.
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