I'm running vista x32, not x64 but when I got this laptop I copied my SH3 folder over from my XP machine... including GWX and the... unmentionable 3rd partry patch. Worked perfectly.
So, that may be worth a crack for you. Copy a working, de-starforced install over from a working XP installation. I know SH3 CAN run on vista x64, I see no reason why this wouldn't work.
HTH
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