Just upgraded to firefox 4 and it won't start but it says it's running.

I just recently upgraded to firefox 4 and it won't work. I was enjoying the lastest update on firefox 3 and it was working fine, but when i upgraded to 4, the problems started. Every time i click on the icon, the mouse turns into the loading wheel for a few seconds and then goes back, but firefox doesn't load up. Nothing happens. I have tried restarting the computer, but that does nothing. I then tried uninstalling it, but it says firefox is still running so it can't uninstall. Even after restarting my computer, it still says it's running. I have tried everything, but it just won't start, and I can't do anything because it claims to still be running.

I just had a similar problem and it reminded me of trying to install a logitech wireless mouse a while back. Nothing I could do to make it recognize the driver... until I ran across a website that told me that antivirus and firewalls might prevent it. So... AVG Free just updated itself earlier today... FF4 would only startup once after reboot, then start and show in task mgr but no window(s)... Uninstalled AVG new version. FF4 starts up every time. Reinstalled older version of AVG Free and now everything seems to be OK again. Hope this helps!

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