1) Install a clean, unmodified GTA III with v1.1 patch 2) Delete the gta3.set settings file from the ''My Documents/GTA3 User Files'' folder (recommended) 3) Run GTA3 Xbox mod v1.0.exe 4) Start a new game and enjoy. The mod replaces cars with HD counterparts, and much more. I myself use one of the best mods for GTA3!