Check to see if Lavasoft Web Companion is installed on your device. Web Companion is Adware
that adds a Windows Service which is designed to run continuously in the background. Once installed this software has been known to cause Lync to freeze or hang during Conference calls. Best to remove this software if your experiencing issues with Lync.
Removal Tool > https://toolslib.net/downloads/viewdownload/1-adwcleaner/
