I am unable to delete an email ad from Sears. When I click on it I get the error message: "Security Alert-Revocation information for the security certificate for this site is not available. Do you want to proceed?" If I click on the "Yes" or "No" box, nothing happens and I am unable to leave the message unless I end the task with TaskManager. If I come back and put the mouse pointer on that message, the same thing happens again.