When i try to open firefox, I get a message saying another copy is already running. I have tried shutting down comletely and computer still thinks there's another copy running. How can this be?

There are two separate desktops on this computer, one for me and one for another user. Her Firefox is not affected. I have looked everywhere for this second copy supposedly running but I don't see how it can be because I have shut down all programs several times.

There are a few possible causes for that error, for details see [[Firefox is already running but is not responding]].

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When I try to open Firefox I get a message saying it is already open. However it is not open and i cannot access Firefox

When I try to open Firefox I get a message saying it is already open. However it is not open and i cannot access Firefox

See:
* http://kb.mozillazine.org/Recovering_a_missing_profile
* http://kb.mozillazine.org/Profile_in_use
* https://support.mozilla.com/kb/Firefox+is+already+running+but+is+not+responding
If it happens after you've closed Firefox and want to restart the see these:
See "Hang at exit":
*http://kb.mozillazine.org/Firefox_hangs
See "Firefox hangs when you quit it":
*https://support.mozilla.com/kb/Firefox+hangs

When I try to open Firefox, I get a message saying that firefox is already currently running, although it is not running. Close and try again or restart computer. How can I fix this?

I always close Firefox when I am finished with the web. When I try to open it later, I often get a message saying that firefox is currently running, so close it first. As far as I can tell, firefox is not running. The message then says to restart your computer and try again. I restart my computer and then firefox opens.

https://support.mozilla.com/en-US/kb/Firefox%20hangs See '''hang-at-exit'''

HT1923 I had to restore my computer and had to reinstall itunes. Now when I try to open itunes I get a message saying it is a new version than my itunes library. How do I fix this?

I had to restore my computer and had to reinstall itunes. Now when I try to open itunes I get a message saying it is a new version than my itunes library. How do I fix this?

Try the following document, only be sure that none of the boxes in the compatibility mode tab are checked (not just the compatibility mode box itself):
iTunes for Windows: How to turn off Compatibility Mode

Discontinued my creative cloud membership, and installed Acrobat XI, but when I try to open it, I get a message saying I must renew creative cloud. This is a self standing program. What do I do?

Discontinued my creative cloud membership, uninstalled Acrobat XI, and installed a brand new, purchased version Acrobat XI, but when I try to open it, I get a message saying I must renew creative cloud. This is a free standing program, and it IS installed. What do I do?

You may need to uninstall the Cloud (not just stop using it) and then run the Cleaner to remove all vestiges... and then reinstall Acrobat
-http://helpx.adobe.com/creative-cloud/help/install-apps.html (and uninstall)
-http://helpx.adobe.com/creative-suite/kb/cs5-cleaner-tool-installation-problems.html

HT203175 When I try to open itunes i get a message saying: File "iTunes library.itl" cannot be read because it was created by a newer version of itunes. Any help out there?

When I try to open itunes i get a message saying: File "iTunes library.itl" cannot be read because it was created by a newer version of itunes. And itunes will not start up. Any help out there?

Hi did you ever get a solution to this problem? Having the same issue myself!

When I try to start Firefox, I get a message saying that Firefox is already running and cannot be re-started, so close down and reboot.

Following an upgrade of my OS from XP to Vista, I tried to point the new installation at my old profile. Now when I try to start FF, I get a message saying that it is already running and I should reboot to clear the problem. I've done that but the problem remains. I have uninstalled firefox and reinstalled v4 beta. The problem remains. Any ideas?

OK, I had moved the profile file inside the profile folder which was created when I installed FF, to the main FF folder. I then took the equivalent file which existed under XP before my upgrade to vista, and moved it into the new Profile folder. That's when I hit the problem described in the initial question.
So, what I did following Tony's response was to move the bookmarks password and cookies files into the profile created on the install. I then moved that file into the profile folder and moved the one I'd saved from XP, out to the main FF folder.
Started FF and voila! All working fine. Thanks for your help.

When I try to open firefox, I get a message that says, "firefox is already running" and to close it or restart my computer when it is NOT running, so I can't get on the internet through firefox. What is wrong?

The information box pops up when I click on my desktop icon for firefox as well as if I try to access it in other ways. I have restarted my computer. I have tried removing firefox and redownloading it. No matter what I do, it still gives me a box saying it is already running, but not responding. When I pull up my taks bar, it is not running! I can't close it as the box suggests because it is not open to do it. I just keep getting a box saying it is already running no matter what I try to do, even though it is not running.

I have tried everything I could to fix this, but some things require actually being on Firefox, and since I cannot get on, I cannot click on the tabs to do it. I have even totally uninstalled firefox, and that has not fixed this. I still get the same message that firefox is running and I need to close it or restart (which I have also tried dozens of times). I have removed things like Java, and that has not helped either. If I cannot even get on line in firefox, how can I fix this. I am not crazy about using internet explorer, but right now, it is my only option. I even tried to start in safe mode, and the same message box pops up!

When I try to open Firefox, I get a message that one is already open, though I'm not able to access it. How can I eliminate the invisible version?

I've been having problems with pdf and Firefox on my iMac. In the absence of being able to find an 'uninstall' function (and reinstall with a newer version), I deleted Firefox by dragging the application item to the trash and deleting. Then I downloaded a new Firefox version 5. But, when I try to open it, the above message comes up. This happens even if I shut down and restart. what do I need to do?

I have tried everything I could to fix this, but some things require actually being on Firefox, and since I cannot get on, I cannot click on the tabs to do it. I have even totally uninstalled firefox, and that has not fixed this. I still get the same message that firefox is running and I need to close it or restart (which I have also tried dozens of times). I have removed things like Java, and that has not helped either. If I cannot even get on line in firefox, how can I fix this. I am not crazy about using internet explorer, but right now, it is my only option. I even tried to start in safe mode, and the same message box pops up!

At times when we try to open Firefox we get a message it is already running and have to restart comp . Why is this ?It happens with all users . Thank you

We have gone on our comp after a while and tried to open Firefox . When we do we get a message "Firefox is running close app or restart comp . " Now the thing is I was on it earlier and closed it with the close button . Then say checked mail , or looked at pictures on my comp . Then I would want to use the browser again and when I tried to access it I get that message . Rest assured it had been closed . This issue did not happen until I downloaded Firefox4 . We did not have this problem with the earlier versions of Firefox .

https://support.mozilla.com/en-US/kb/Firefox%20hangs See '''hang-at-exit'''

When I try to open Firefox I get a message: Mozilla Crash Reporter: firefox had a problem and crashed. Will try to restore your tabs and windows when it restarts. When I click on restore this same error box keeps appearing

I can't open Firefox and thus can't get to my.yahoo.com or any of my bookmarks.

Everything is good. Downloaded 8.0 and got fully restored - bookmarks too. Thanks for being so helpful, Swarnava.
JackDrake

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> ''(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}

When I try to open Firefox I get a message: "Update could not be installed. Make sure there is not another instance of Firefox. Restart and try again."

Started w/FF 29 something.on Win XP (Home) SP3
Verified w/Task manager and PS that there is no other instance of FF.
Occurs only in my profile, administrator and other users do not get this message.
First Resetting, did not work.
Safe mode also did not work.
Uninstalled completely, even deleted the Firefox folder from my profile and rebooted.
Downloaded new versions, installed and same issue.
Firefox now version 33, all seems up to date but I still get that message. When I open Help > About it says I am at version 33 and to restart to upgrade...
Any ideas greatly appreciated.
Have reverted to SeaMonkey for now.

Hello sprytely, go for a clean re-install, this means you '''remove Firefox program files''' and then reinstall Firefox. Please follow these steps:
'''Note:''' You might want to print these steps or view them in another browser.
#Download the latest Desktop version of Firefox from the next full installer https://www.mozilla.org/en-US/firefox/all/ and save the setup file to your computer.
#After the download finishes, close all Firefox windows (click Exit from the Firefox or File menu).
#Delete the Firefox installation folder, which is located in one of these locations, by default:
#*'''Windows:'''
#**C:\Program Files\Mozilla Firefox
#**C:\Program Files (x86)\Mozilla Firefox
#Now, go ahead and reinstall Firefox:
##Double-click the downloaded installation file and go through the steps of the installation wizard.
##Once the wizard is finished, choose to directly open Firefox after clicking the Finish button.
More information about reinstalling Firefox can be found [[Troubleshoot and diagnose Firefox problems#w_5-reinstall-firefox|here]].
WARNING:Do not use a third party uninstaller as part of this process. Doing so could permanently delete your [[Profiles|Firefox profile]] data, including but not limited to, extensions, cache, cookies, bookmarks, personal settings and saved passwords. These cannot be easily recovered unless they have been backed up to an external device! See [[Back up and restore information in Firefox profiles]]. 
Thank you.

When i try to open itunes i get a message saying itunes is on a locked disk

i cannot open itunes when i try i get a warning message saying that "the folder "Itunes" is on a locked disk or you do not have permission for this folder"
whats the problem???

check if you have read & write permissions for your music folder. in finder, right-click on it and get info. unlock the little padlock (you may have to enter your admin password) and change the permission settings. next, click on the little gear-shaped icon and apply to enclosed items like so
the important part is to apply to enclosed items !

When I try to open Mozilla, I get a message saying "unresponsive script" which is caused by SAH toolbar. Wont let me continue or very slow. Affecting whole system. How do I fix?

When I get message it says cause is Script: chrome://sahtoolbar/content/sahlog.js:121 This makes opening slow or impossible until I am able to close it. It is also affecting all other programs i run ie. cannot print, same message comes up. Often Mozilla just shuts down in middle of session. I run e-commerce business and loosing sales. Need help!
How can I fix?
Jamocajim

Have not been able to. I am not that computer knowledgeable when it comes to this kind of stuff. Can you tell me how to disable it

When i try to open firefox, I get a message saying another copy is already running. I have tried shutting down comletely and computer still thinks there's another copy running. How can this be?

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