[ubuntu] Ubuntu 11.10 unable to login

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http://ubuntuforums.org – Hello! I´ve been using Ubuntu 11.10 for a couple of months without any problem. However i´m now unable to log in. It happened after i installed Sophos Antivirus. The system got awfully slow after the installation so i tried to shut my laptop down. The system then refused to shut down (nothing happened) so i performed a hard reset. Then, at the login screen after i enter my password a black screen is showed like half a second and the login screen comes everytime back again. This happens also with the guest account and using both Unity and Gnome desktops. I already deleted the .Xauthority fi (Hardware)