Windows could not start the Lync Server Front End

Hello,
When I open my PC and try to start Lync I have this error and when I click OK the program is not starting. It worked just fine until now and I don’t remember to install anything or change some settings. Any solution ? How can I solve this error ?
Thank you !

Services
Windows could not start the Lync Server Front-End on. For more information, review the System Event Log. If this is a non-Microsoft service, contact the service vendor, and refer to service-specific error code -2164761487.
OK
