That the original SB!Live, or the 5.1? The former doesn't behave quite right on the PCI bus, causing all kinds of problems - the infamous "VIA chipset bug" being the most known one. Actually, it's the SB!Live card that crashes the VIA chipset, not the other way round. I'd be less than surprised if other chipsets (and other PCI cards) wouldn't be affected by the presence of SB!Live.
Simply use a different card. SB!Live 5.1 has the issue fixed, anything else by anyone is fine too - just avoid the SB!Live.
regards, Peter