At this very moment i can't say what does the log files says because i have uninstalled the drivers and there is no ati folder under /usr/share.
Anyway, the steps to install the drivers are:
1 - download and untar the zip file, wich results in a .run file
2 - turn the .run file into executable by "sudo chmod +x ati...run"
3 - run the file "./ati...run"
4 - follow the instructions provided by the setup installation window, choosing "install the driver under xorg 6.9 or later" (or something like this)
5 - after it finishes, issue the "aticonfig --initial" command in the terminal
6 - reboot...
Are these steps correct?