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The update could not be installed. Please make sure there are no other copies of Firefox running on your computer, and then restart Firefox to try again - what to I do?? I have shut off and restarted and keep getting this message

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I keep getting this error message - "The update could not be installed. Please make sure there are no other copies of Firefox running on your computer, and then restart Firefox to try again" what do I do?? I have shut down my computer and am still having this problem. HELP.....

User Agent

Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Zune 4.0; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152)

I keep getting this error message - "The update could not be installed. Please make sure there are no other copies of Firefox running on your computer, and then restart Firefox to try again" what do I do?? I have shut down my computer and am still having this problem. HELP..... == User Agent == Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Zune 4.0; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152)

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Firefox is trying to update but it can't because Firefox is running

Open the task manager with Ctrl + Alt + delete. Click on the Processes tab and find firefox.exe. Click End process