I did install ATI driver using the Install/Remove Software (same way as I did in the beginning). The first time I did install the driver I did ad the ATI repositories "http://www2.ati.com/suse/11.4/" and then it installed automatically. Then when I uninstalled it I did unselected the drivers (I did got some message but because before I did installed the driver everything work great so I ignored that message). Now I enabled the repositories and selected the drivers again and install, but somehow after installing the driver it is not working correctly.
I will try what "please_try_again" advice me to do and see if it will work out.
I will let you know after restarting.