Gnome broken after ATI driver installation.

[l46kok]

My release is 2.6.40.3-0.fc15.x86_64.

I've followed the guide (http://forums.fedoraforum.org/showthread.php?t=155503) to install a driver for my HD 6870. Installation was successful, it's just that when I made few subtle changes, namely the dual monitor settings and resolution changes and then rebooted the computer, GNOME shell just died on me and whenever I attempt to log on it gives me the error "Oh no! Something has gone wrong."

I've logged into the command line ver by ctrl+alt+f2, ran dmesg and this is the error message i got:

[86.921145] gnome-shell[3461]: segfault at 5 ip 0000003f47e37fb9 sp 00007fff1a967d80 error 4 in libcairo.so.2.11000.2[3f47e00000+a6000]
[88.322759] gnome-shell[3873]: segfault at 5 ip 0000003f47e37fb9 sp 00007fff7b613600 error 4 in libcairo.so.2.11000.2[3f47e00000+a6000]

.

Uh, so how can I revive the GNOME shell so that I can once again log in to my computer