when starting my computer, i get to the windows login screen and press on my personal login name, it says "loading personal settings..."  like normal and makes the login sound, but then immediatly says "logging out.."  and makes the log out sounds and returns me to the login screen..

ive tried booting it up in safe mode and starting it with "last good configuration", but both led to the same result..  dell couldnt really help over the phone either, what should i do?  any ideas would be appreciated.