revocation information for the security certificate blah blah.

Often when I open Windows Live Mail I get multiple pop up windows telling me revocation information for the security certificate blah blah blah.  And I can't do anything with WLM until I close all of the pop ups, sometimes close to 10 of them.  I'd like this to stop.  Can anyone tell me why this happens or how to stop it?  It doesn't happen every time, but it does happen often.  Thanks.

-Tim