installing creative sound blaster audigy live!

Hello, im having a problem with my sound card. I was using win ME and i could
install my sound card (creative sound blaster audigy live!) and still use the
sound card that came with my motherboard... I WAS ABLE TO USE BOTH SOUND
CARDS AT SAME TIME... I USE IT THAT WAY TO MAKE MUSIC MIXES.

Now i have win xp and i can not use both cards.. the one that came with my
MSI motherboard and the creative sound blaster audigy live! one. if the SB
card is installed... win xp does not recognize the motherboard sound... but..
if i disconect the SB card off the PCI slot... the win xp recognice the
motherboard sound.

What can i do to make both work at the same time as i was able to do with
win ME?

thanks for all the help you can give me!

JM