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I have tried to update Firfox 5.0 to 6.0 and I get a message "publisher couldn't be verified. When I tried to open a full copy of 6.0 I get a message. "file corrupt. Can you give me any suggestions?

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I tried to update two laptops with the same results. I am told that the file is corrupt when trying to install the full version. I am told that the publisher could not be verified when I try to update from version 5.0 and when I continue to upgrade, I am informed that the file is corrupt.

I am running Norton Internet Security.

Chosen solution

Download latest Firefox version from one of these links:

Uninstall your current Firefox

Installing Firefox on Windows (use the Downloaded latest Firefox installer)

Check and tell if its working.

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Chosen Solution

Download latest Firefox version from one of these links:

Uninstall your current Firefox

Installing Firefox on Windows (use the Downloaded latest Firefox installer)

Check and tell if its working.

more options

Uninstalling Firefox and then deleting the Mozilla directory and downloading and installing the full version 6.0 worked. Thank you for your help.