Firefox 6. says update is available. when i try to install error that other firefox is currently running so update will not install. then firefox starts. i verified no other programs are running on the pc but still get same message

This began when an auto update was downloaded to my pc late August. I do use thunderbird 6.02 and that is up to date. That I closed before Firefox update attempt. Task mnager in windows 7 says no programs are running. Current version in firefox is 6.0 with update available when i go to help about firefox.

If there are problems with updating then best is to download the full version and uninstall the currently installed version.
Download a fresh Firefox copy and save the file to the desktop.
* Firefox 7.0.x: http://www.mozilla.com/en-US/firefox/all.html
* Uninstall your current Firefox version.
* Do not remove personal data when you uninstall the current version or you lose your bookmarks and other data in the profile folder.
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.
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
If files already have been downloaded then you may have to remove the files in the updates and updates\0 folder.<br />
You can delete active-update.xml and updates.xml as well if present.
C:\Documents and Settings\&lt;user&gt;\Local Settings\Application Data\Mozilla\Firefox\Mozilla Firefox\updates
(%USERPROFILE%\Local Settings\Application Data\Mozilla\Firefox\Mozilla Firefox)
The "Application Data" folder in XP/Win2K and the "AppData" folder in Vista/Windows 7 are hidden folders.
*http://kb.mozillazine.org/Show_hidden_files_and_folders

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