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In Firefox 4 why won't Microsoft Security Essentials update the virus definitions?

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I upgraded to Firefox 4.0.01 and Microsoft Security Essentials was unable to update virus definitions, by uninstalling and going back to Firefox 3.6.17, I was able to get the latest virus definitions from Microsoft.

I upgraded to Firefox 4.0.01 and Microsoft Security Essentials was unable to update virus definitions, by uninstalling and going back to Firefox 3.6.17, I was able to get the latest virus definitions from Microsoft.

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Microsoft Security Essentials shouldn't even need a web browser for doing updates.