Hey so at a garage sale today I saw a gaming computer for 40 bucks. the seller told me it could run half life 2 at the lowest settings so i'm obviously going to have to update the cpu, gpu, power supply and ram, but as far as the mobo, hard drive, and sound card go, do you think I'll need to upgrade them too? I didn't get the computer but I'm sure that if I went back tomorrow it would still be there.