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I have administrator rights to my own computer (Windows 7 64 bits), and have started Firefox as administrator, but it tells me that I have no administrator rights to update it! What to do?

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It asks me to contact the system administrator, but that is me! Of course I can reinstall Firefox, but it is a bit frustrating.

It asks me to contact the system administrator, but that is me! Of course I can reinstall Firefox, but it is a bit frustrating.

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Download a fresh Firefox copy from http://www.mozilla.com/firefox/all.html and save the file to the desktop.

Uninstall your current Firefox version.
Don't remove personal data when uninstalling.