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ACCESS IS DENIED DUE TO SECURITY POLICY ENFORCEMENT

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ACCESS IS DENIED DUE TO SECURITY POLICY ENFORCEMENT

ACCESS IS DENIED DUE TO SECURITY POLICY ENFORCEMENT

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Firefox doesn't have a message like that, and Firefox doesn't have a way to enforce that type of security policy. Probably caused by a Windows7 security setting, a 3rd party program installed on that PC, or maybe something setup with your internet service provider.

Are you the Administrator on that PC, and the "owner" of the ISP account?