Not a new user. This problem is on my desktop computer. Can't get on internet on that computer, so am using laptop, which may display incorrect info for this question.
If you use ZoneAlarm Extreme Security then disable Virtualization and reinstall Firefox.
Other security software may have similar features to prevent Firefox from updating files properly.
Do a clean reinstall and delete the Firefox program folder before reinstalling a fresh copy of Firefox.
Download a fresh Firefox copy and save the file to the desktop.
Uninstall your current Firefox version, if possible, to cleanup the Windows registry and settings in security software.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
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 you uninstall Firefox.
Cor-el Thanks for reply. However,I see you said DO NOT remove personal data when I uninstall current version, so I can get a fresh copy of Firefox. How do I avoid removing my personal data?
The uninstall window has a check-box to keep or remove your personal data and if that setting is selected then Firefox will remove all profile folders.
This will cause you to lose all personal data like bookmarks and stored passwords.
This problem doesn't require a new profile and deleting the Firefox program folder and a reinstall should be sufficient.
See my above reply about how to make a backup of your personal data as is always recommended.
New question: Have downloaded a new copy of Firefox to my desktop. Cannot find screen or place to UNINSTALL. Where do I find that? If I go to Add/Remove Programs, I cannot find the place you told me to click on to avoid deleting my personal data.
Went to Control Panel, where I should be able to get to Uninstall, from what I have read. My Control Panel screen has no PROGRAMS option, so cannot go to Programs and Features, where I understand I can find UNINSTALL. What am I missing here?
An uninstall most likely doesn't help in this case, only deleting the Firefox program folder to remove all the files to do a clean (re)install will make sure that Firefox gets installed properly.