Install /uninstall problem-you must close firefox to continue HELP

I was trying to install newest version of Firefox and it keeps saying that I must close Firefox, but it's not open. Now I can't open the previous version and when I tried to uninstall previous version, I get that same message that Firefox must be closed. HELP I'M STUCK! I WANT MY FIREFOX BACK!!!!!!!!
HELP PLEASE
Windows 7
I think previous version was 3.57?
HP Laptop

If there are problems with updating then best is to download the full version and uninstall the currently installed version and delete the Firefox program folder to remove any leftover files.
Download a fresh Firefox copy and save the file to the desktop.
*Firefox 10.0.x: http://www.mozilla.org/en-US/firefox/all.html
Uninstall your current Firefox version, if possible.
*Do NOT remove personal data when you uninstall the current version or you lose your bookmarks and other data because all profile folders will be removed.
Remove the Firefox program folder before installing that newly downloaded 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.
*http://kb.mozillazine.org/Uninstalling_Firefox
Your bookmarks and other profile data are stored elsewhere in the Firefox Profile Folder and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Profile_backup
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

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in AOL I try to access one of the news items and get an error message Firefox encountered a problem and must close.
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Can you start Firefox in [[Safe Mode|Safe Mode]] by holding down the Shift/Options key?
If you have submitted crash reports then please post the IDs of one or more recent crash reports that have a "bp-" prefix:
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Sometimes when I just closed Firefox for security purposes and when I try to open new browser, "it states, Firefox is still running and you must close it first" That is not so, Why is this?

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* http://kb.mozillazine.org/Firefox_hangs
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Everytime I open iTunes and start to browse for new music, I get the error message, "iTunes encountered a problem and must close." I have tried re-installing iTunes and QuickTime with no progress. Now, my iPod will not show up in iTunes or in my PC(my computer). Please help.....I have no idea what else to try.

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Have you tried working through this Apple article on
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http://docs.info.apple.com/article.html?artnum=302856
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Thunderbird has ecountered a problem and must close...how can I fix this?

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I'm having the same problem.
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hey, jane!
the same thing with me i don't know if it's my computer or iTunes network but this is a huge problem! i thought it was just me since my computer is constantly having problems but i'm glad to see that i'm not alone on this (well, i'm not glad that their computers aren't working or anything like that but you know what i mean
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I'm having the same problem.
I updated to 8.1 and it closes as soon as the shuffle is plugged in.
So I tried disabling auto-sync. No luck
So I tried loading an older version of iTunes - says I have to have 8.1
So I tried uninstalling and removing all itunes related files - and reinstalling. Still closing every time I plug in.

Install /uninstall problem-you must close firefox to continue HELP

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