How to fix problem with lag in cod 4 single player

i have the problem....i play COD 4 Single Player and his laging,but when i look down he stop lag or when i look in sky he stop lag!!when i walk and look in enviroment hi lag like he as to go 30 fps\s !! im not tryning to fix that because i don't now how to fix! any idea???
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More about problem single player
  1. What are your system specs? you might have your graphics up to high for it to process, but 30 fps isnt bad, as long as you dont stare at a smoke grenade
  2. try lowering resolution or turning of anti aliasing

    don't use he recommended specs thing it doesn't work right
  3. Update your graphics driver, also is your system capable of running the game properly?

    Here are the requirements...

    Recommended requirements:
    CPU: 2.4 GHz Dual Core or better
    RAM: 1GB for XP and 2GB for Vista
    HD: 8GB Free Space
    GFX: 3.0 Shader Support, Nvidia Geforce 7800, ATI Radeon X1800 or better.

    Minimum requirements:
    CPU: Intel® Pentium® 4 2.4 GHz, AMD® Athlon™ 64 2800+ processor
    or any 1.8Ghz Dual Core Processor or better.
    RAM: 512MB RAM (768MB for Windows Vista)
    HD: 8GB Free SPace
    GFX: NVIDIA® Geforce™ 6600, ATI® Radeon® 9800Pro or better
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