I have said this too many times to count, yet I have never recieved a response as to whether or not it was helpful. I do not intend to repeat myself again, thus this thread.
My Specs....
AMD Athlon 2000+(1.7 GHZ)
512 MB DDR RAM
Geforce 4 TI4400 128 MB Ram
Windows XP
When I first played Live 2003, it was unplayable, even at a 1024 x resolution with many graphic options turned down to medium. The game was very choppy, and I had similar framerate difficulties as those mentioned on these boards. I suggest that you all try turning off the V-Sync option in the detail menu. After I did this, I was able to run the game smoothly at the highest resolution, and w/ all the detail settings on max. I am not saying that this is the definitive solution, but its worth a try.