The 2011 version of WLM should be repaired since it has at least one bug regarding Junk Mail filtering that is fixed by repairing. Go to Programs and Features "Windows Live Essentials" and click the repair button at the top of the window. In the next window that pops up choose "repair". All installed components of Essentials will be repaired, including Mail. (Not sure if this will fix your window issue, though.)