Hi,
I had Vista 32 Bit, and uninstalled it because the OS kept the computer busy.

I up/down (?) graded to XP64, now CPU and disk is available for the applications!
I'm much happier with XP64 than with Vista.
Also my impression is that I have less PoserPro crashes with XP64 than with Vista
(still too much, though)

Some drawback is that my mainboard (ASUS) does not work properly with 8 Gigs
of RAM (no overclocking done, still when it's cold (!), I get frequent bluescreens)
so I've downgraded to 4 Gigs of RAM again. :-(

Best regards,
   Michael