If this doesn't do the trick:
Then you probably have one of those weird newer cards that isn't covered by the kernel and you indeed need to install ALSA. Right now you did a vanilla desktop RH install. RH being weenies, don't give you a compiler by default... but the alsa RPMS should be on that CD somewhere, as well as gcc, cc and a bunch of other stuff. You can go either way, compile from source, which means you're going to have to rpm on a lot of compiler/tools, and then compile alsa, or find the RPMs for alsa, I think they still package that as an option...
Regardless, take a look at the graphical package managers you have on board.