I think I gave a wrong link ( a typo ), try
this one instead
Go to the following section:
How do I enable 3D support for my ATI Radeon card in Fedora Core 2?
In step 5, you should replace the rpm installation command with:
rpm -ivh --force fglrx-4.3.0-*.i386.rpm
( That's what the ATI installation readme says )