Yep, even though Firaxis/Sid Meier put out a Win 2000/XP patch for my favorite game, the P4 processor appears like a dual processor to the game AI, and it won't run. It's possible that if you disable HT on the processor, that it will work, but I have not actually tired this. Instead, I still have my old P2 450Mhz machine to run it on...