My computer has a serious lag issue, I did multiple virus scans and I've defragged once since the issue began (yesterday actually). This did not help the issue though. I attempt to play one of 3 or 4 games that have the issue, and my computer starts them up, and then seems to hiccup and lag my video and mouse all at the same time, and it does this every 2-3 seconds. This namely didn't make sense to me because the games this is occurring on are Starcraft, Diablo II, and Warcraft III. Yet I can play Sins of a Solar Empire, Black and White II, Assasin's Creed, World of Warcraft as well as many other games lag free. Is there any reason it is only happening on these games? And is there a fix for it? I also reinstalled XP on the primary partition because of the issue, and it did nothing. The system is not overheating, and I have all my needed and correct drivers. (I didn't get any new hardware in the past month or so).