Solved Login Loop Ubuntu 13.04

My Ubuntu 13.04 suddenly got login loop of disaster…

I cannot login to my account but i can login to guest account

i solved it (after 2 hours) by :

pressing Ctrl + Alt + F3 and logged into shell

type

mv .Xauthority Xauthority.bak
sudo apt-get install --reinstall xorg
sudo reboot

i can logged to my account again

fiiuuuuh