Why can't i install firefox on windows 7

When I try to install Firefox on my windows 7 desktop platform (running this as an administrator), I can download the install file "Firefox Setup 4.0.1.exe", but when I run the file (also as administrator), I get an 'Extration Failed' pop-up stating that it cannot open an output file.

Will it work if you right click the downloaded exe and choose run as administrator?

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