Why won't Firefox open after updating? Says to close, but how?

Windows 7. Attempted to update to latest Firefox today, but it won't open on my screen. When I attempt to either use the previous version or delete it, it says to close it first. How do I close something I can't see? Thanks.

See:
*http://kb.mozillazine.org/Browser_will_not_start_up
Try to run the Firefox program once as Administrator (right-click firefox.exe: Run as Administrator). 
If that doesn't solve the problem then remove the Firefox program folder (C:\Program Files\Mozilla Firefox\) to do a clean reinstall.
A possible cause is security software (firewall) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls

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[[Flash Plugin - Keep it up to date and troubleshoot problems]]
[[Flash 11.3 crashes]]
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http://forums.adobe.com/thread/1018071?tstart=0
http://blogs.adobe.com/asset/2012/06/inside-flash-player-protected-mode-for-firefox.html
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== User Agent ==
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Whenever you have a problem with Firefox, whatever it is, you should make sure it's not coming from one of your installed add-ons, be it an extension, a theme or a plugin. To do that easily and cleanly, run Firefox in [http://support.mozilla.com/en-US/kb/Safe+Mode safe mode] and select ''Disable all add-ons''. If the problem disappears, you know it's from an add-on. Disable them all in normal mode, and enable them one at a time until you find the source of the problem. See [http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes this article] for information about troubleshooting extensions and theme. You can troubleshoot plugins the same way.
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*https://support.mozilla.org/kb/Safe+Mode
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* http://kb.mozillazine.org/Menu_differences
*Windows: Firefox (Tools) > Options
*Mac: Firefox > Preferences
*Linux: Edit > Preferences

Why won't Firefox open after updating? Says to close, but how?

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