The correct "GTA San Andreas Fitgirl Repack Fixed" torrent is identifiable by the following and naming convention :

This is the holy grail for San Andreas players. It fixes hundreds of bugs, restores dual-monitor support, and ensures the game runs at a stable frame rate without breaking the physics engine.

Save as sanandreas-fix.reg and double-click to merge it. This tells Windows to run the game in Windows XP SP3 compatibility mode (the most stable setting).