Ok, so I just downloaded COD WAW on PC and i'm playing the last mission to get zombies for commentaries etc and i'm playing smoothly but then it starts to lag like my FPS would be 75+ but then it would drop down to 12 I really want to play this game since it took me 9HRS to download can someone please help me? I would do anything and if I need to update my drivers then please tell me how because I'm clueless.


Operating System
MS Windows 7 Home Premium 64-bit SP1
CPU
AMD Athlon II X4 620 58 °C
Propus 45nm Technology
RAM
8.00 GB Dual-Channel DDR2 @ 399MHz (6-6-6-18)
Motherboard
PEGATRON CORPORATION VIOLET (CPU 1) 56 °C
Graphics
HP w2338h (1920x1080@60Hz)
256MB GeForce 9100 (HP) 114 °C
Hard Drives
625GB Western Digital WDC WD64 00AAKS-65A7B SCSI Disk Device (ATA)
Optical Drives
DTSOFT Virtual CdRom Device
hp CDDVDW TS-H653R SCSI CdRom Device
Audio
Realtek High Definition Audio

I know my Graphics card is bad but I don't know how to update it please teach me how.

Please forgive me if it's the wrong section I just really need help with this because I also have bought a new game an d I can't run it I have 4+ games that I can't run please help!