I downloaded firefox 5, than upgraded to 6.0.2 version. After upgrading I rebooted, then when I try to run the Firefox it always says need to restart to complete previous upgrade. I did that severa times, but same thing. I tried to remove it using add/remove, it will not do it since it asks to restart to complete the upgrade. I tried reinstall, will not reinstall unless the upgrade is completed. So the firefox never opens. It did before the upgrade. What do I do?