I have the game Grand Theft Auto: Vice City on my Windows XP Service Pack 3 system but it doesn't run very smoothly. It jams from time to time. Sometimes it even crashes. I can't understand why this is happening, because I also play GTA: San Andreas on my PC and this one works fine. Vice City and San Andreas have similar system requirements so it can't be a problem related to hardware(heating, bad ventilation, dust) or system resources. The CD that I use for playing the game(genuine) is in good condition. I have no mods for Vice City. My system specs are: Processor: Intel Pentium Dual Core 2.5 GHz; Graphics board: ATI Radeon HD 4670/4650 1Gb; 2 Gb of RAM. Please help me.