Firefox will no longer start after downloading the last update

Yesterday (2/7/14) I downloaded the latest Firefox update. While the update was being installed I got a Parse error message. When I tried to restart Firefox nothing happened. I tried reinstalling Firefox (both with and without uninstalling the old version) and Firefox would start at the end of the installation process but after I closed Firefox it would not restart. I tried starting it in the safe mode but that didn't work. When I use the Task Manager Processes tab I see Firefox open for about a second and then it disappears.
I was finally able to get it to open by using Windows Explorer to set the compatibility mode of the Firefox.exe file to "Windows 2000" but I don't think that is a good solution.
Note that I am running the Windows XP Professional operating system.

Yes, I uninstalled Firefox, deleted the program folder, and then reinstalled Firefox. Firefox still would not start until I set the compatibility to Windows 2000.

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