Installation won't complete, but Firefox can't be uninstalled, because installation isn't complete.
Repeated requests to restart computer after update to 18 don't work.
Helpful replies
Try to run the Firefox program once as Administrator (right-click: Run as Administrator).
Try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.
Go to answer 1Additional System Details
Installed Plug-ins
- Google Update
- McAfee MSS+ NPAPI Plugin
- Adobe PDF Plug-In For Firefox and Netscape 10.1.4
- 4.1.10329.0
- Shockwave Flash 11.1 r102
- The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
- BlackBerry WebSL Browser Plug-In
- NPWLPG
- Office Plugin for Netscape Navigator
Application
- User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:18.0) Gecko/20100101 Firefox/18.0
More Information
Take care when following instructions do NOT use any option to remove personal information,because it will destroy your bookmarks and passwords etc.
Have you got security related software of any sort installed
- if so what
- could that be blocking the install
See also
- How to fix the Update Failed error message when updating Firefox
- and as a last resort follow this advice to stop the upgrade process and try again (an old article but info appears up-to-date) https://support.mozilla.org/en-US/kb/Updates%20reported%20when%20running%20newest%20version#w_delete-update-configuration-files
Helpful Reply
Try to run the Firefox program once as Administrator (right-click: Run as Administrator).
Try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.
Question owner
Here, I have a solution (from Windows 8). In the "Start" screen, right click on the Firefox app. Then click the "open file location" at the bottom of your screen. Highlight and delete all Mozilla files. THEN you can do a fresh download from firefox.com. (Here's what didn't help: starting in safe mode, uninstalling the software, running as Administrator.) Good luck!
Try to run the Firefox program once as Administrator (right-click: Run as Administrator).