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Firefo 5 downloaded but not launching, say file corrupt

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I have downloaded successfully the firefox5, when I open this from folder to launch the Firefox, say `File corrupt'. I remove the download and again downloaded, but same problem in 3/4 tries.

I have downloaded successfully the firefox5, when I open this from folder to launch the Firefox, say `File corrupt'. I remove the download and again downloaded, but same problem in 3/4 tries.

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Temporarily disable your anti-virus application only long enough to download Firefox.