There used to be all kinds of problems with Sound Blaster Live!s and VIA chipset motherboards (but I think it was isolated to the KT133 chipsets). Fixes included (off the top of my head):
1. Moving the SB Live to the very last PCI slot (at the bottom).
2. Updating to the latest motherboard and sound card drivers.
3. Changing PCI bus options in the BIOS. The problems arose with the SB Live attempting to "hog" the PCI bus. I'm not sure of the exact setting(s) that required changing (one I think is to lower PCI latency timer), but there was a PCI Latency patch released by a third party that attempted to combat the problem. Try some googling for PCI hog, SB Live and VIA.