KDE 4.1 won't start

[Eric]

I just upgraded from 6.06 LTS to 8.04.1. I installed KDE 4.1. When I try 
to start it the screen says KDE 4.1 and then it shows graphically the 
different processes are shown loading. It gets all the way to the "K" 
and then it goes back to the login screen.

Any ideas?