I'm sure any new xp disk will have SP2. SP stands for Service Pack (in case you didn't know. If you did, no offense) and Microsoft releases one every year. I am pretty sure OEM is something about the original maker of the computer. So if you are wondering about it, your own couston build can have extra RAM, hdd space, better video/sound cards, and other accessories that will be good for gaming. But I would imagine a comp by hp or somone else would be more stable. Please excuse me if I am wrong. And shupola, pleasse clarify what you mean.