When you installed those mods, did you use some kind of mod installer? Or you manually added/replaced them in the gta.img file or you used the custom.img?
If you used the custom.img, simply remove all the mods from the IMG, or remove the file completely.
If gta.img, download a new copy of it (google search) or use this link to;
http://www.4shared.com/file/tluMU8ub/Ba ... a3Img.html (I didn't test it, just found it)
When downloaded, place it in your Models folder, copy and replace and try starting your game. PM me if anything.
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