A hardy ghost of Firefox is apparently running in my computer and I am unable to open Firefox, even after Window restarts and an uninstall/re-install. How do I find and fix this problem?

What happened first is Firefox was revving and using most of my CPU, ultimately "not responding" too easily and for too long, so I closed it in order to reopen it, but Firefox remained running in background (Task Mgr, Processes) after closing, continuing to use almost all my CPU, so I ended the process in Task Mgr.
When I went to re-open it, window opened and told me Firefox could not be opened because another "instance"(?) was still running, to close it or restart Windows. I couldn't close it because I already closed it AND ended the process, so I restarted Windows.
When I tried to open Firefox, I got the same pop-up. I think I restarted Windows one more time, and then uninstalled Firefox, except for my personal settings (in order to save the bookmarks, which I couldn't find in the Firefox folder in Program Files (only Favorites, which were not my bookmarks; I later wondered if they were part of the Firefox add-on "Add This" --??).
I then uninstalled Firefox and re-installed it. When I tried to start the newly re-installed program, I had the same pop-up telling me Firefox was already running and to close it or restart Windows.
I searched my computer folders for anything that might help, did a Search of the computer for "Firefox", and was given some Firefox folders and if they weren't from the new re-install, I deleted them. One thing I noticed was that the program folder did NOT have the program (Firefox.exe) icon to start Firefox.
I uninstalled Firefox and had to resort to using Internet Explorer, which I do NOT like. My rich library of bookmarks are who knows where.
I don't know if this is related, but in searching my computer's Administrative Services and Component Tools (and the like) hoping to find something that would help me fix Firefox, I inadvertently learned that "MMC could not create the snap-in. The snap-in might not have been installed correctly. Name: .NET Framework 1.1 Config."
Please help me get Firefox back and figure out what is going on in my computer that led to this. I am a basic user and not techno-computer saavy, so if anyone can help me with this, please give me step-by-step bonehead instructions.
Thank you so much for any help you can offer!

Make sure that Firefox is set as the default browser.
*http://kb.mozillazine.org/Default_browser
*https://support.mozilla.org/kb/How+to+make+Firefox+the+default+browser
*https://support.mozilla.org/kb/Setting+Firefox+as+the+default+browser+does+not+work

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