Firefox does not start anymore

I selected the: automatically update in Firefox.
After the update was installed Firefox will not start anymore. The error is:

 Firefox
I just uninstalled it and reinstalled Firefox, but I had this a couple of times now. Very annoying.
Also, I open Firefox as Administrator. No luck.
Klantenteam4Asked:
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Klantenteam4Connect With a Mentor Author Commented:
Installed version 4.
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drilusCommented:
This was taken from: http://support.mozilla.com/en-US/questions/791573

"Try a clean re-install.

    Download the setup file from http://www.mozilla.com/en-US/firefox/RC (this is for the Firefox 4 release candidate)
    Uninstall Firefox, do not select the option to "Remove my Firefox personal data"
    Delete the Firefox installation directory - http://kb.mozillazine.org/Installation_directory
    Re-install Firefox

This process does not remove the Firefox user data such as bookmarks and passwords which are stored elsewhere in the profile folder.

You may also need to manually reset the Software Update feature by deleting the software update files as shown in the "Software Update not working properly" section here - http://kb.mozillazine.org/Software_Update"

Installation Directory: http://kb.mozillazine.org/Installation_directory
Software Update: http://kb.mozillazine.org/Software_Update
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Craig KehlerDirector of Customer Service & Community RelationsCommented:
What version do you currently have when you select automatically update?

It might also help to check for any orphaned firefox processes via Ctrl-Shift-Esc, select Processes, sort by image name and look for firefox.exe before running the uninstall. If you don't have a firefox running and see a process in the task manager, then it's likely orphaned and can be ended by right clicking on it and selecting End Process. Note that if you just leave a Downloads window open or an add-on window that opens a new window it will keep firefox.exe running.

Also note that the final release version is available, you'll probably want to use that installer if you aren't already.

If all else fails you could try running firefox from the command line with firefox.exe -no-remote after the reinstall.

If you aren't the only user of the system there could be another user with firefox.exe open.
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Klantenteam4Author Commented:
I was using Firefox 3.6.13.
I now updated to version 4 by not using the "Remove my Firefox personal data" and deleted Firefox 3.6.13.

There were no open Firefox 3.6.13 processes open when I openend it so it had full control on firefox.
It is not the first time this happens.

I am aware of the Mozilla KB, but it is a very strange behaviour.

Any thoughts on how to prevent this?
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Craig KehlerDirector of Customer Service & Community RelationsCommented:
Sorry I've only seen that issue due to my usage of multiple profiles simultaneously and sometimes orphaning processes. Surprised I haven't run into it yet...

I guess it could be some sort of contention issue with antivirus on a temp file.
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remixedcatCommented:
I installed my FF4 on another directory.
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Klantenteam4Author Commented:
2
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