For Windows Vista Only, not XP.

This problem may be caused by unsigned audio drivers on Vista. The fix will require a change to your Windows Registry. With any registry change, it is highly recommended you create a backup before making any modifications to your registry.  Once you have completed the backup, follow the steps below. Please do not make any other changes to your registry.

To backup your Registry, follow the directions below:
Click Start. In the search area, type regedit.exe and hit the Enter key.

Once the Registy Editor opens up, to go File..Export
Ensure that ALL has been clicked and enter a file name (regbackup_DisableProtec.reg)

Be especially careful changing the registry below.

1. Click Start. In the search area, type regedit.exe and hit the Enter key.

2. If Vista prompts you for permission, click Continue.

3. In the left-pane, navigate to the following: HKEY_LOCAL_MACHINE..SOFTWARE..Microsoft..Windows..CurrentVersion..Audio.

4. In the right-pane, double click on DisableProtectedAudioDG, and then change the value from 1 to 0. Click OK.

5. Close the Registry Editor.

6. Restart your computer.