If your AVG virus vault is empty and you get the error message of “Endpoint is a duplicate" try the following steps:
- Open Regedit.
- Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AudioEndpointBuilder\Parameters.
- In the right pane check the value of ServiceDll. If the value is %SystemRoot%\System32\Audiosrv.dll, it's the cause of the problem. It should be: %SystemRoot%\System32\AudioEndpointBuilder.dll.
- Change the ServiceDll to it’s correct value.
- Reboot your computer.
I hope this will help.