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Does not recognize OS for purpose of other websites

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When attempting to use websites like Battlefield 3's "Battlelog" and Netflix's "Watch Instantly", which require Windows Vista or Windows 7, these websites fail to recognize my OS, which is Windows 7 64-bit.

I recently uninstalled an addon called Masking Agent, which purported to hide a computer's specifications from websites. How this addon got onto my computer I am unsure.

When attempting to use websites like Battlefield 3's "Battlelog" and Netflix's "Watch Instantly", which require Windows Vista or Windows 7, these websites fail to recognize my OS, which is Windows 7 64-bit. I recently uninstalled an addon called Masking Agent, which purported to hide a computer's specifications from websites. How this addon got onto my computer I am unsure.

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Thank you very much. That cleared the problem right up.