Do the other users get *any* sound at all ? If not then when booted
into their profiles check the hardware setting for sound and see if it
hasn't been updated to the new card. Should be automatic but you never
know.

Also try creating a new user from within your working profile to see
if that one has sound.

There are two sound systems available, the Audigy and the mother-board. The
Audigy does not show up in his hardware profile. He is getting sound
through the motherboard chip on the box front headphone jack. How do I add
the card to his profile?

If both audio systems are active then that's going to confuse matters
greatly, so go into BIOS and turn off the on-board sound. That way
every user will be using the Audigy card as default