Acer 7720G vs Call of Duty 4

Ok guys first of all Im new to these forums so hey everyone my names James
My problem is in the title, Call of Duty 4 Modern warfare, for the past two days I have been on the phone to Activision (the makers of Call of Duty) and the Acer support line, trying to resolve this problem, and as you can guess nothing I have tried so far seems to work.
I have tried all the basic stuff, updated my display & sound drivers, checked my firewall, opened certain ports the game needs open to work, all sorts, and so far nothing seems to improve the graphics of this game. Im also experiencing some Ping/Latency problems, around 85Ping when im in a low ping server. The reason im convinced it’s mainly graphics that’s effecting my game play is because I also play World of Warcraft (for anyone that doesn’t know it, it’s a massive online game with just over 11million people that requires a good inet connection) and WoW seems to run fine.
Im really confused as to why im getting choppy and poor graphics when the Aspire 7720G has such good specs.
If anyone could give me some advice on what I could try now please it would be much appriciated, and like I said before I have tried all the basics.
I also noticed that when im in the F2 menu on startup, it says next to video 256MB, the notebook is capable of alot more is there any way I can up the MB the graphics card uses?
Heres my DXDIAG
Time of this report: 5/12/2009, 12:53:27
Machine name: JMZ-PC
Operating System: Windows Vista™ Home Premium (6.0, Build 6001) Service Pack 1 (6001.vistasp1_gdr.090302-1506)
Language: English (Regional Setting: English)
System Manufacturer: Acer
System Model: Aspire 7720
BIOS: Default System BIOS
Processor: Intel(R) Core(TM)2 Duo CPU T5750 @ 2.00GHz (2 CPUs), ~2.0GHz
Memory: 3070MB RAM
Page File: 1189MB used, 5149MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 10
DX Setup Parameters: Not found
DxDiag Version: 6.00.6001.18000 32bit Unicode
Card name: NVIDIA GeForce 9300M G
Manufacturer: NVIDIA
Chip type: GeForce 9300M G
DAC type: Integrated RAMDAC
Device Key: Enum\PCI\VEN_10DE&DEV_042E&SUBSYS_011E1025&REV_A1
Display Memory: 1522 MB
Dedicated Memory: 243 MB
Shared Memory: 1278 MB
Current Mode: 1440 x 900 (32 bit) (60Hz)
Monitor: Generic PnP Monitor
Driver Name: nvd3dum.dll,nvwgf2um.dll,nvwgf2um.dll
Driver Version: 8.15.0011.8585 (English)
DDI Version: 10
Driver Attributes: Final Retail
Driver Date/Size: 4/30/2009 22:02:00, 7593472 bytes

 

According to this website http://www.notebookcheck.net/Gaming-Performance-of-recent-laptop-graphic-cards.13815.0.html, the 9300GS can only mange cod4 at low settings. What settings are you runing at?
Sometimes simple thangs can help, have you tried a defrag on the hard drive, power saving set for max performance? limit background tasks to the minimum.