I played gta4 at a friends house and I don’t have a ps3 but I do have a computer (windows xp) when will gta4 come out on it.
Although nothing has been confirmed there are rumors that GTA 4 could come out on the PC before the end of the year. October seems to be the month of choice but that’s all rumors. You are running Windows XP so I would have to assume your computer may be a few years old and your hardware may not be able to play GTA 4 without a few upgrades perhaps. Now one knows what kind of minimum requirements a computer may need to play GTA 4 but if the graphics on the PS3 and Xbox 360 are any signs than a pretty decent graphics card may be needed for sure. Spend a few hundred dollars to upgrade your computer or spend a few hundred dollars on a next gen console? At least you have a few more months to decide, good luck.