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Evertime I try to download firefox it says the file is corrupt. How do I fix this?

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I cannot download firefox. Everytime it finishes downloading, it says the file is corrupt.

User Agent

Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; InfoPath.2; .NET CLR 3.5.30729; .NET CLR 3.0.30729; AskTB5.4)

I cannot download firefox. Everytime it finishes downloading, it says the file is corrupt. == User Agent == Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; InfoPath.2; .NET CLR 3.5.30729; .NET CLR 3.0.30729; AskTB5.4)

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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 work. Do not forget to re-enable the scanning in your anti-virus software after you are finished with downloading and installing. .......... See http://kb.mozillazine.org/Unable_to_save_or_download_files (Disable virus scanning in Firefox preferences - Windows)