This is an issue that has been around awhile, and I had it when I moved to Windows 8 as well, just run through these steps
1. open Regedit 2. Navigate to the following key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Audio\ 3. Right click on Audio and choose New -> DWORD value 4. Name it as DisableProtectedAudioDG, change the value from 1 to 0.
NOTE: Please backup registry before making any change.