OldSchool

I'm probably missing something very simple, but, I've been downloading cars and such to add to GTA SA for PC, each time I use the SAMI Mod Installer, whether it is the mod installer or not, the load page will freeze with the bar about halfway through. Saved Games on the other hand, after I put them in the folder, I try to load the game and it just starts at the beginning, intro an all. Any help offered would be much appreciated, I really want to play with that R/T Challenger.