I am not familiar with KDE, but removing or renaming the .kde-folder (or something like that) in your home-folder should do it. After that: log out, log in again, and see what happend.
edit: or have a look at this thread: http://forums.fedoraforum.org/showthread.php?t=193870
Desktop: Intel Core 2 Duo 2.13 GHz, 2 GB RAM, 2.5 TB HDD, GeForce 8600 GTS : Fedora 15 x86_64
Notebook: Dell xps with Intel Core 2 Duo 2.13 GHz, 4 GB RAM, 320 GB HDD , GeForce 8400m GS : Fedora 13 x86_64
Server: Intel Celeron 900 MHz, 128 MB RAM, 20 GB HDD: Debian stable
Last edited by kto; 10th July 2008 at 10:04 AM.