Need some help with GTA IV (PC)

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Thank you both, especially Jarz for the explanation and support. I'll input the code into my directory and see how that goes. Funnily enough I don't actually get any texture problems as I have modded a few vehicles, instead I get a Fatal SMPA60 error which I've been told is because the cars I have downloaded have the wrong mesh and textures so it interferes with the game itself. So I've reinstalled the whole game from steam and I'm going to make sure I backup my files before trying anything.

Thanks again for the support you guys