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hi.

my opinion for u is that ur gta san Andreas shows this problem because while installing it some files are shown corrupted especially/mostly two files

1: ...models/(gta_int.img or gta 3.img or both)

2: ...streams/beats.

and the main and only cause of this problem is that ur cd/dvd is scratched..!!

So i recommend u that u buy a new cd without any scratch.

good luck