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On one of my back-up Win XP Pro Computers Thunderbird will not start! All I get is the "Critical Stop" Alarm!

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Recently on one of my back-up Win XP Pro Computers Thunderbird Ver. 31.4.0 will not start. All I get is the the Microsoft "Crtitical Stop" alarm. I tried to update the program with no results and even tried to uninstall the program to install a fresh version but the uninstall would not work! What should I do?

Recently on one of my back-up Win XP Pro Computers Thunderbird Ver. 31.4.0 will not start. All I get is the the Microsoft "Crtitical Stop" alarm. I tried to update the program with no results and even tried to uninstall the program to install a fresh version but the uninstall would not work! What should I do?

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Just download the full installer from https://www.mozilla.org/en-US/thunderbird/ and run it.