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How do I remove a patch for Grand Theft Auto 4?

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I installed Grand Theft Auto 4 and it was lagging really bad and I didn't know how to fix it so I installed a patch and now GRAND THEFT AUTO 4 WON'T EVEN OPEN NOW! So I think it caused because of the patch, does anyone know how to remove it? If yes, do you also know how to make it stop lagging??? I have Windows 7 and it lags a lot! Does anyone know?