in terminal, try this:
rpm -e xmms
It'll show you a list of dependencies.
use rpm -e (each one of those dependencies)
then do
rpm -e xmms
again
this will uninstall XMMS
Next, go to the XMMS site and download the tarball
NOT THE RPM
then 'unzip' the files
in terminal, cd to the 'unzipped' directory.
run the following command:
"./configure && make && make install"
Minus the quotes, of course.
after this is done, XMMS is now properly compiled to your kernel, and this should solve your problem. It will also have the MP3 plugin already installed, so you wont need to re-install that. Just find the executable binary and run that. Then all is good in the world of Fedora Core 2.
Hope this helps.