GTA 4 dando lag nas teclas W S A D

Question

Tenho GTA 4 original e meu PC ta dentro das recomendações de hardware do jogo, só que quando aperto as teclas w s a d e um lag pra cada aperto se eu aperta sem parar qualquer uma dessas e ele praticamente para, queria saber se alguém conhece alguma configuração pra acabar com isso.
Rodo ele com um AMD Phenom II X4 3.4 Black, ATI HD5670 1 GB, 4GB memória Dual Chanel, Fonte 680W e Win7.
Não tenho problema com qualquer jogo instalado no meu PC só com o GTA4.
 
Olha só ai os requerimentos dele, o meu PC era pra rodar sem problemas:
1) SYSTEM REQUIREMENTS
Supported Operating Systems are:
    Windows Vista (plus Service Pack 1)   
    Windows XP (plus Service Pack 3)
        plus DirectX 9
        plus Microsoft .NET Framework 3.5
Minimum Hardware Requirements:
    Processor: Intel Core 2 Duo 1.8Ghz, AMD Athlon X2 64 2.4Ghz
    Memory: 1.5GB
    Free Hard Drive Space: 16GB
    Video Card: 256MB NVidia 7900 / 256MB ATI X1900
    DirectX 9 compatible Stereo Sound Card
    Keyboard
    Mouse
Recommended Hardware Requirements:
    Processor: Intel Core 2 Quad 2.4Ghz, AMD Phenom X3 2.1Ghz
    Memory: 2GB (Windows XP) 2.5GB (Windows Vista)
    Free Hard Drive Space: 18GB
    Video Card: 512MB NVIDIA 8600 / 512MB ATI 3870
    DirectX 9 compatible Surround Sound Card
    Keyboard
    Mouse

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