Let me know if you guys find anything that fixes this. I'm getting the same problems you are getting with the laggy game and the wierd off color pixels on the lights and some colors. I'm using this setup, which is basically the same as all the others here: Intel Core 2 Duo E7200 4 GB RAM ATI 4850 512MB GDDR3 (Catalyst 8. Windows XP Pro SP2 64-bit Sim City 4 Deluxe