alittle more info......

i have plenty of ram...4 GB ddr2 dual,680i LT mobo,q6600 intel quad,about 600 gb free hd.i made this pc so i could do this graphics thing and it seems to not be cutting it.the files we're working with are large; 700mb at times then we layer more on top of that till it gets to about 2.5 GB of ram in use........then it freezes.im using xp pro,adobe cs3,i used the 3 GB switch in bcd edit.helped a little not enough.do i need a server set up?64-bit?