[[C]_[H]KiLLeR]

Like your said your PC's very old I purchased my PC 5 years ago but my PC's running GTA:SA perfectly but I get lag if I encounter with my modded vehicles so try to buy some new pieces&video card in your PC if you can't you should maybe buy a new PC.
But don't buy a new PC if you got a one you can buy PS3,Xbox 360 there got no video card&sound card problems thats why i love consoles no need for buy new pieces to run new games i hate this thing in PC so the consoles are awesome I will also buy PlayStation 3 Slim+Call of Duty 4:Modern Warfare 2!

Thanks...