No sound in Windows 7 Virtual machine.
"No audio output device is installed"
In order to resolve the issue, please do the following:
NOTE: Please take a snapshot of the virtual machine before performing the instructions: in the menu bar go to Virtual machine -> Take a snapshot.
please go to Start > right-click on Computer > Manage > Device Manager
Find Parallels Audio Controller > Uninstall
right-click on Computer (at the top of the list) > Scan for hardware changes
Sound device was disabled