Can we atleast know what Graphic chipset are you using.Assuming it's onboard,what series of Intel does it belong to? If 845 then Serious Sam,Serious Sam:Second Encounter & Mafia will surely run without a hitch.Same goes for Hitman,Hitman:Silent Assasin & Hitman:Contracts (Don't even think of Blood Money
).If the onboard is even lower than that then you are probably screwed in terms of high end gaming.