Failed to update Firefox 15, sometimes there's an 7zip error message says "refuse to access".

sometimes there's an 7zip error message says "refuse to access", and always failed to update to the new version.
The install process silently exit, and many files in firefox install direcotry have been added .moz-backup suffix.

Which security software (firewall, anti-virus) do you have?
If an update fails then it is possible that other (security) software is preventing the updater from replacing the files.
You can try these:
* run the Firefox installer program or Firefox itself as Administrator (right-click: Run as Administrator)
* boot the computer in Windows Safe mode with network support (press F8 on the boot screen)
You may need to delete the Firefox program folder yourself if you keep having problems.
do a clean reinstall and delete the Firefox program folder (C:\Program Files\Mozilla Firefox\) before reinstalling a fresh copy of Firefox.
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 if there are still problems.
*http://kb.mozillazine.org/Installation_directory
Download a fresh Firefox copy and save the file to the desktop.
*Firefox 15.0: http://www.mozilla.org/en-US/firefox/all.html
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 in the Firefox Profile Folder and won't be affected by an uninstall and (re)install, but make sure that "remove personal data" is NOT selected when or 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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thanks

Hi there ramerr,
You may find the troubleshooting steps in the article below helpful.
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http://support.apple.com/kb/ts1814
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Failed to update Firefox 15, sometimes there's an 7zip error message says "refuse to access".

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