The driver disk I have is only used on initial install, if you're trying to do an NFS or FTP install. If you already have the system running, you don't really need it.
What kernel are you running? I have the driver compiled for the default kernel as well as the "yum update"d one. I actually found compiling the driver to be painless: make sure you have kernel-devel installed, then grab the tarball from realtek, and make. It was easy.
Now, if you install SME, then do "yum install kernel-devel", you'll get the newest kernel-devel, but if you haven't run "yum update" yet, you won't be running the newest kernel. Is that what you did? Can you run a yum-update?
I can get you either driver.