I am using windows XP with 128 MB of RAM & service pack 2 installed. CALL OF DUTY requires 128 MB of RAM and was running fine on my computer. I cleared several stages of it. But at one stage the game is moving very very slowâ€¦.taking lot of time to move. (the stage where we have to eliminate guards at the main gate and locate Major Ingram within 10 minutes.) All the other stages before that stage are working fine. What seems to be the problemâ€¦â€¦â€¦..