Did you download the full installer from Download Firefox For All languages And Systems {web link}

Did not work. Download full installer, Windows 64-bit.

Error: The application was unable to start correctly (0x0000279) Error: The exception unknown software exception (0x06d007e)

I have also re-booted many times.

Some have problems with the 64-bite. Can you try installing the 32-bit?

Did that, still did not work. Same errors. Is there a way to completely clean FF out of my computer to start fresh?

Let’s do a full clean re-install;

Download Firefox For All languages And Systems {web link}

Save the file. Then Close Firefox.

Using your file browser, open the Programs Folder on your computer.

Windows: C:\Program Files C:\Program Files (x86)

Mac: Open the "Applications" folder. https://support.mozilla.org/en-US/kb/how-download-and-install-firefox-mac

Linux: Check your user manual. If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it. See Install Firefox on Linux; https://support.mozilla.org/en-US/kb/install-firefox-linux

If you downloaded and installed the binary package from the Firefox download page, simply remove the folder Firefox in your home directory. http://www.mozilla.org/firefox#desktop ++++++++++++++++++++++++++++ Do Not remove the profiles folder.

Look for, and rename any Mozilla or Firefox program folders by adding .old to them. Do not rename the Mozilla Thunderbird folder if there is one.

After rebooting the computer, run a registry scanner if you have one. Then run the installer. If all goes well, remove the OLD folders when you are done. +++++++++++++++++++++++++++ If there is a problem, start your Computer in safe mode and try again.

http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode This shows how to Start all Computers in Safe Mode; Free Online Encyclopedia

A couple of but I will try to work around it. I can't close Firefox after downloading because Firefox is not working. I get the errors when I first click on the install program. The profile folder is gone to.

What I will now try is to start the computer in safe mode, and click the 32-bit install program. Keep your finger's crossed.

Well it kind of worked. FF is now launching but after a two tabs open FF crashes and has to close down. I re-launch and it crashed again. That was the original issue what led me to un-install and then re-install.

Is there a way to wipe all trace of FF so I can do a completely virgin install?

The instructions I posted under full clean re-install should remove all of Firefox except for the profiles.

Hello Fred, Sorry for the delay. Well I finally got Firefox reinstalled, but I still have the original issue. After a while I get a message that pops up saying, "Firefox has stopped working." when I hit the close button, Firefox closes and I have to restart it.

I was hoping a clean and re-install would fix this. It didn't. Any suggestions?

Use these links to create a new profile. Use this new profile as is. Is the problem still there?

http://kb.mozillazine.org/Profile_folder_-_Firefox#Navigating_to_the_profile_folder

https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles

https://support.mozilla.org/en-US/kb/how-run-firefox-when-profile-missing-inaccessible

Type about:profiles<enter> in the address bar.