If your game is freezing due to a corrupt keys.dat , do not reinstall the entire 700MB game. Follow these steps:
keys.dat is a data file used in Grand Theft Auto: Vice City to store licensing and copy protection information. The file contains encrypted data that is used to verify the game's authenticity and ensure that it's not being played on unauthorized hardware or with pirated copies. The file is usually located in the game's installation directory and is required for the game to run. keys.dat gta vc