It looks like you're missing a Realtek driver because you have an old distro with old kernel.Maybe you should go here
to read a little about it or use NdisWrapper
.Mr.Google pointed me to this
page for a little help about it,but there are lots of pages here at LQ also,just search for them.
You could run commands like;
in the Konsole to look for more info about your hardware and network.