mobility radeon 7500 won't cut it at all...

quake 3 arena came out in 1999 hehehe... back when a TNT2 ultra and Geforce 1 and 750 MHz Slot A Athlon were state of the art

so in short, Doom 3 will be unplayable on your laptop hehe (lahat naman yata ng laptop except for the alienwares or something )