hitman bloodmoney help..

so hitman runs glitchy on my computer cos i only have 512mb of ram so i figure lets get rid of the cd...but using daemon and securom it shows a black screen with red loading bar and always just brings me back to windows...its making me so mad. ive tried everything from 1.0 fixed exe to images to updating 1.1 and mounting image...could it be my pc? i need help =\