Need help with MAFIA

Hey guys, i need some help with MAFIA.i knows its an old game but this is the first time i am playing and i have reached till A Trip To The Country but in this mission when i enter the warehouse the game stops for a loading screen and when the loading ends my game crashes.to be honest, this game isn't an original version, is it because of this or is it because of graphics problem. my configuration is latest with an Intel 965 Original Motherboard,Core2Duo 2.13 Processor,1GB DDR2 Ram running at 667MHz, 80 GB SATA HDD.I have no Graphics cards other than the Intel inbuilt graphics.

Please help.