I downloaded and installed proprietary ATI drivers and i followed the procedure given in the other thread you posted for susja for the similar query......
after installation of driver and reboot when i went to desktop effects in system tab i got an error that a package has crashed (package is desktop-effects 0.8.4-7.el6) and when i tried install this package from the cd of rhel 6 , i got the message that this package is already installed...........but it is crashed there.......so what should i do.........i tried to download it but i didn,t found it on net......