You have to install the rpm's via the command line.
go root :
If you have the ones off the ati website, try
rpm -i atidriver.rpm
if that fails, try :
rpm -Uhv --force atidriver.rpm
It should install successfully, if so tap in :
If a program pops up ( text mode ), answer questions an write the config file. Note that, you need the right settings for your mouse / sync ranges, etc. My config failed hundereds of times due to my mouse settings being wrong --- ironic, we're trying to get a graphics card to work .. !
anyway, once you've finished the questions, and writen the file, do :
ctrl + alt + backspace
and login again, then :
If you get an error, rerun the config. ( fglrxconfig )
Hope this helps