If you use RHEL5, Please setting "xorg.conf",or you maybe not enter Graphics interface
 
Before install driver,modify file of "/etc/X11/xorg.conf"
Add information as following:
 
Section ˇ§Extensionsˇ¨

          Option         ˇ§Compositeˇ¨   ˇ§Disableˇ¨

EndSection
