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Thunderbird application won't open. How can I find what's blocking it?

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I am working in XP pro. After updating, neither Thunderbird or Firefox won't open. They both show up as processes in task manager, but not as applications. I tried uninstalling and re-installing from your sites. Still no luck. How can I restore these two programs?

I am working in XP pro. After updating, neither Thunderbird or Firefox won't open. They both show up as processes in task manager, but not as applications. I tried uninstalling and re-installing from your sites. Still no luck. How can I restore these two programs?

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Can you kill the tasks and try to open them in Safe Mode? http://www.wikihow.com/Start-Firefox-in-Safe-Mode

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Asịsa Ahọpụtara