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Problem with Upgrade and re-installment!

Yesterday an automatic upgrade of Thunderbird happened. When I restarted my computer the program could not opened and I've dowloaded the latest version and tried to re-intalled, but after pressing the RUN button , a window pops up* which says the following and I cannot get further and moreover the program does not open any more even that I've tried to reinstall it many times.

*"Error opening file for writing. C/program files?MozillaThundebird/mozMapi32.dll
Click rentry or try again or cancel to stop the installation"
 
sad I’m frustrated
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