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Did you update your drivers lately. if you did sometimes the setting that it uses standard conflicts with your games. So maybee you can use this advice i pasted under her. I posted that some time ago when ohters had problems in ohter game.
Disabling Clientside effects
Some computers seem to choke as they encounter firefights in maps with an already high number of polygons. Particle effects caused by rounds hitting hard surfaces eject further polygons which can severly limit your framerate in critical situations. Disabling particle effects will help or eliminate this problem altogether. The tradeoff, however, is that you will not be able to see bullet impacts, or impact marks (including 203 marks). Use this at your discression because impacts can frequently be helpful at triangulating an unseen enemy's position.
Video Card driver switches
Antialiasing (AA)
Any GeForce or Radeon card is capable of displaying 2x to 4x (sometimes 6x) AA. AA is basically dithering of the surfaces in game. It makes the 'jaggies' formed by two surfaces meeting to be rounded and seem much more natural. AA can make a game look fantastic, but can cause significant FPS hits. For the Radeon Users, you will be happy to note that engaging AA may have little or no hit to your FPS at all, however GeForce users will notice a considerable FPS hit with every level of AA increase. Decreasing AA to 2x of 0x will increase FPS dramatically. Decreasing the value to 0x on Geforces is somewhat easy, simply slide the bar till it says 'No AA'. On Radeons it is a bit more complex. Slide the bar till it hits 2x, then click the box next to the slider that says 'Application preference'.
Anisotropic Filtering (AF)
Anisotropic Filtering allows textures at long range to come through with greater clarity and prescision. Again this is one of those Quality vs Speed issues. Radeon owners again will see little FPS hit while increasing the slider up to about 4x, but Geforce owners will be disappointed just as they were with AA. AF can make maps like recon look absolutely REAL, and also increase target identification at long distance. AF crispens distant textures, bringing out the subtle hues they should have. To remove AF simply do similar steps as with AA, sliding to 0x. Additionally, force PERFORMANCE AF rather than QUALITY. There is no real difference in actual viewing quality, and changing it to performance seems to make thing smoother.
AGP 2x, 4x, 8x and FASTWRITE
IF your motherboard supports any of these options, attempt to maximize them. Enabling AGP8x on and 8x compatible maching will increase bandwith to the video card increasing FPS. Enabling fastwrite (a BIOS option on newer motherboards) will accomplish the same task. Both together will maximize your Card's potential on your system.
AGP Aperture Supplemental information by [-UNITY-]Bane[ECF]
Newer motherboards are capabile of using system RAM as a secondary source for video memory. It's kinda like a on-board video memory system similar to integrated video cards (except in this case you use your dedicated video card memory first.) In any case, if your system resorts to using your system RAM to supplement to your video RAM, it is 1) slower than your video card and 2) much more CPU intensive. Overall system performance will drop.
The dreaded hardware modifications
CPU upgrade
This may require a new motherboard, but if you were smart with your initial mobo purchace it should be fairly expandable. Look to increase your FSB (front side bus) where possible as it will allow higher bandwith to all the system devices. However dont be fooled, sometimes increased FSB may mean you need new System RAM as well (Gulp). Short of a higher FSB, simply get a more powerful CPU that uses the same FSB but a higher clock value.
Increasing your CPU power will increase general framerates on all maps. Why? AASF is a highly polygon intensive game. CPU tends to be the great limiting factor when it comes to rendering polygons. If your CPU can only push so many polygons to your videocard in a certain time, some of your video card's raw power may go untapped.
Increased RAM Size or Speed
Increasing either RAM capacity, or speed will increase the texture bandwith to your videocard (assuming your mobo is up to it). This will decrease times of system lag as textures load on screen, causing dips in a stable framerate.
Supplemental information by [-UNITY-]Bane[ECF]
Ideally, you should always run your CPU and RAM at the same FSB. You should always run your CPU and RAM at the same FSB speeds on nForce2 motherboards.
A More Badass Videocard
The baddassest (is that a word?) videocard on the planet wont do you any good if you dont have an appropriately scaled system. For instance I would not dream of putting a thoroughbread Radeon 9800XT on a 1.2ghz Tbird with 133mhz RAM. The raw power of the video card would NEVER be tapped.
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