Tried to upgrade from firefox 3.6.2 to 3.6.3, error message says another instance of firefox is running, then 3.6.2 opens. This occurs when i start firefox after restarting the computer, or when i try to install the upgrade

Whenever i try to open firefox, i get a message that firefox cannot install the upgrade because another instance of firefox is running. Then firefox 3.6.2 will start. running windows 7 64 bit. This will occur every time i try to open firefox, after rebooting or any time i close it and reopen firefox.
== This happened ==
Every time Firefox opened
== I Ok'd the upgrade from 3.6.2 to 3.6.3

Do a clean (re)install and download a fresh Firefox copy from http://www.mozilla.com/firefox/all.html and save the file to the desktop.
Uninstall your current Firefox version and remove the Firefox program folder before installing that copy of the Firefox installer.
It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
You can skip the step to create a new profile, that is not necessary for this issue.
See http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

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