Can't login into account

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http://askubuntu.com – When I boot Ubuntu, I enter my pass but then I see a blank screen and then I'm thrown back into the login screen. I am able to only access the guest account. I am using 11.10 (unity). Also, during my few hours running Ubuntu, it would occasionally crash and throw me back to the login screen, only now I cant login back anymore. (HowTos)