This game runs just fine in Windows 7 64pro.
I just built a new machine and am amazed how few resources AH uses for a modern computer:
i7-860 on Intel DP55KG board
Cooler Master Hyper 212 cooler
GTX 260 vid card (cheap, and I hate ATI)
TP550W Antec PS
160gig Intel SSD + 1 TB Raptor RAID + I TB HDD
Using motherboard audio
No stress at all running max settings @ 1920 x 1080. GPU runs 45C, CPU runs 35C. Yawn.
NEVER drops below monitor refresh rate.