error while loading shared libraries:
libstdc++.so.5: cannot open shared object file: No such file or directory
Here's the solution:
Try to download the rpm package compat-libstdc++-33-3.2.3-55.fc5.i386.rpm first from the following URL:
http://download.fedora.redhat.com/pub/fedora/linux/core/5/i386/os/Fedora/RPMS/
Once the previous step is completed, install Realplayer10GOLD again by running
./RealPlayer10GOLD-1.bin
It surely works now.