I try to open Firefox. Get error message saying Firefox is already running and needs to close - another error message say Firefox can't open

Turned on laptop (rebooted) after being away from it for a few hours. Went to open my home page. Error message popped up saying Firefox is already running and must be closed. I closed it and another error message popped up saying Firefox can't open - incomplete or missing files.
I went into Processes to close Firefox. Selected 'end process' but nothing happened.
Tried to use Internet Explorer but it just gets hung up. Cannot access anything.
And, because I can't open Firefox, I can't go a refresh.
Everything was working just fine a few hours ago.
Any thoughts?

What is the computer system and Firefox on the bad computer?
Separate Issue;
Your System Details on this computer shows;
Multiple versions of your Adobe programs.
Having more than one version of a program may cause issues.
Go to '''adobe.com''' and download the full installers after removing
all of the old programs.
Start '''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Firefox in Safe Mode]''' {web Link} by holding down the '''<Shift><br> ''(Mac Options)'' ''' key, and then starting Firefox. Is the problem still there?
This is not a cure but will make it easier if Firefox locks up in Windows.
'''https://support.mozilla.org/questions/997866''' {web link}

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    Message was edited by: -888-

    Look, I had it running _few times_ too until it crapped out and gives the error since (on my own other computers - which I don't care since I have no use for any QT/.mov myself, but I repeat from post 1: I need it working on my Mother's comp).
    And talking about 'bad drivers' - yes, I know that the drivers are sometimes at fault and bad drivers can make entire windoze pc unstable or crash; but how can you suggest this as a cause in this case when I'm telling you that the same error appears on completely different machines? And wouldn't this error appear from begining, from very first use of QT Player if it were bad drivers? Sure it would if it was faulty driver, but since it didn't that's not the case obviously.
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    *I don't want any itunes or other junk,*
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    Message was edited by: -888-

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    #**[http://support.mozilla.com/en-US/kb/Troubleshooting+plugins Troubleshooting plugins]
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