Were you allowed to login into the DE ?
Just keep on logging in with the password. You will be allowed to login sometimes the 3rd attempt. If you cannot wait then do this-- Press CTL+ALT+F3
--when a shell is there login as regular user then issue this--
~$ rm -f .ICE* .Xauth*
(this one you should be in your $USER/HOME directory not somewhere else, and
~$ sudo find /tmp -name .X0-lock | xargs rm -f
Press again, this time CTL+ALT+F7
and login as regular user.
Hope that helps.