Can't delete Firefox 4 Get message to close open Firefox. It's not open.

If I try to update Firefox 4 or try to Remove it from my computer, I get a message telling me to close Firefox and retry. How can I close a program that is not open.

Firefox sometimes does not shut down completely. In these cases, if you don't want to restart Windows, you can "kill" Firefox using the Windows Task Manager.
Press Ctrl+Alt+Esc to call up the Task Manager. Depending on your Windows 7 permissions, this might not work smoothly, but hopefully it will.
Check the Applications tab for any open Firefox windows. If there is one, switch to it and close Firefox normally.
Next check the Processes tab. Firefox.exe should close down within 15-30 seconds after you close the program and it completes its file maintenance. If it lingers, you can select it and End Process. You also could look for plugin-container.exe, which is a process used to run Flash, QuickTime, and various other plugin content.
After that, Firefox should start up without error, although it may apologize for crashing.
Any luck?
If this happens frequently, please post back for preventive suggestions.

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