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I have Windows XP and when I try to install and run 3.6.13, it says the file is corrupted. I don't have any previous versions.

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I have Windows XP operating system. I have never installed any version of mozilla firefox. When I try to install and run version 3.6.13, it says the file is corrupted. I have tried just running it. It said it was corrupted. Then I saved it to my computer and tried running it and it still said the file was corrupted.

I have Windows XP operating system. I have never installed any version of mozilla firefox. When I try to install and run version 3.6.13, it says the file is corrupted. I have tried just running it. It said it was corrupted. Then I saved it to my computer and tried running it and it still said the file was corrupted.

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It is possible that your anti-virus software is corrupting the downloaded files or otherwise interfering with downloading files by Firefox.
You can try to disable the real-time (live) scanning of files in your anti-virus software temporarily to see if that makes downloading and installing work.