Hi Luke
It´s such a pain in the ... when your game of choice does that. I, however, am playing Starcraft without a hitch on XP SP2. Something in your hardware must be teasing you somehow. Any similar problems in other games?
My hardware is an AMD x4200+, MSI MB 6702 with a VIA chipset. 2 GB RAM, ATI X800 AGP, Audigy 2, WD Raptor in RAID 0 and a couple of other HD.
You ARE using the latest patch for StarCraft, right?
Hope you get your probs solved!!
Iznogood