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Getting security certificate error message when accessing Yahoo Mail.

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Whenever I navigate to the login page for Yahoo Mail I get a "sec_error_expired_certificate" error message. It says the certificate expired today, 11/29/11.

I do not get this error when I try to login through Internet Explorer.

I also recently experienced this issue when trying to login to Facebook.

I use AVG free anti-spyware as well as Spybot Search and Destroy. I run multiple scans daily and have had no negative reports (nothing found).

What do I need to do to resolve this issue? Any help would be very much appreciated.

Whenever I navigate to the login page for Yahoo Mail I get a "sec_error_expired_certificate" error message. It says the certificate expired today, 11/29/11. I do not get this error when I try to login through Internet Explorer. I also recently experienced this issue when trying to login to Facebook. I use AVG free anti-spyware as well as Spybot Search and Destroy. I run multiple scans daily and have had no negative reports (nothing found). What do I need to do to resolve this issue? Any help would be very much appreciated.