Remis said:I had the same problem once:
I copied my GTA SA folder for my friend and burned it on a CD. But GTA SA didn't work for him because some files were missing. The missing files weren't copied because they were in the virtual folder of windows.
But with a clean install with the original GTA SA CD it worked for him.
(btw sry for being inactive. My laptop is broken and I will get a new PC in the next days).