I want to Play Call of Duty 2 for PC and I am not sure if my PC would make it fun. Can you computer geniuses help me out? (no pun intended). Here are my specs: 2.66 ghz Celeron D 512 Ram (will upgrade to 1G for x-mas...will this help alot?) NIVIDIA GeForce 5500 FX 256MB 128 bit PCI Thanks a lot and I hope your thanksgiving is fulfilling!