um...where do u live dude....MW2 was released FOR PS3 SXBOX360 and PC
....the prestige and hardened edition of the ga,me were only x360 and ps3.
...i have a NVIDIA GeForce 8400 GS...is that any gd?
If your PC is clean and known to run quite well for what it is (For example a clone of good hardware, not some compaq presario) you maybe able to run it but do not expect a miracle.
Load times would be huge and it should lag quite a bit at start of games and during intense action.
Max 800x600 on super low resolution.
IF your Geforce 8400GS has a respectable heat sync and fan setup, even a minor overclock on it will help but do not overclock if it has this tiny little square with an even smaller fan...