The SB Live cards, especially the 5.1's have been known to have some problems under Win2K. Mainly slow games, terrible sound, popps and crackles, etc. It seems that it's mostly an issue on Via chipset motherboards, but I'm not sure if it's just them. I'm personally going to ditch mine for a Herc Game Theater XP, I'm tired of playing sound with my headphones on all the time.
Sarcasm maybe the recourse of a weak mind,
But it can be funny as hell.