Repara windowsu cu acest soft
http://www.bleepingcomputer.com/download/windows-repair-all-in-one/
Check if Desktop Windows Manager Service is set as Default and started.
a) Click Start and type Services.msc in start search box and hit enter. If User Account Control asks your permission to continue, click Continue or enter administrator’s password to continue.
b) In Services locate Desktop Windows Manager Service and double-click it.
c) In properties window of the Desktop Windows Manager Service, set Startup type to Automatic.
d) Click Start to start the service. If the status is already running, click the Stop button and confirm with Yes to stop the service. Restart the service by clicking the Start button.
e) Click OK to exit and close the Services window.
Am facut asta si dupa ce dau start imi arata iar eroarea.