"Sign In with Windows Live ID" pops up randomly

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When browsing folders normally, for no apparent reason a "Sign In with Windows Live ID" login box pops up.

This is anoying especially since we don't use MSN/Messenger and don't even have the Live version installed. We are not viewing any MSN websites at the time or on these days and we log off at the end of the day and do a full shutdown as opposed to a hibernate so there is no chance of things stayin in memory.

This does seem to be related to one of the recent microsoft updates.

We would like to find out what causes this and what ailes there are for this anoying pop up box.

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