Security Warning pops up when I open Hotmail

EVERY time I open my hotmail e-mail....A Security Warning small box pops up saying:

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Security Warning

Do you want to view only the webpage content that was delivered securely?

This webpage contains content that will not be delivered using a secure HTTPS connection, which could compromise the security of the entire webpage.

More info                             Yes          No

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How doe I stop this eternal security warning appearing each time I open my hotmail e-mail program?

Thanks.

Ed M.