My system specs are in my profile.
The game runs perfectly on Windows XP 32-bit. But when I play it on Windows 7 64-bit, I get this weird rhythmic stutter.
It's very similar to what happened to this user on the game Race Driver
GRID: Weird Slowdown problem - Codemasters Forums
I have that game too but I don't have that problem. Instead I have the problem on NFS Shift. Basically its that slow down but it happens faster and in a rhythmic pattern. Not really a framerate drop but similar to a microstutter.
I tried what was suggested on that forum. Here's what I've also tried:
Compatibility mode in Xp SP3, Vista, Vista SP1, Vista SP2.
Disabling visual themes and such
Updating audio and video drivers
Reinstalling the game
Lowering the graphics settings
So any help?