Thank you Mann for your reply. Here's the answer to your questons.
- Were you able to use this headset earlier on this computer? Answer: Yes it did work and showed up in the Playback and Recording tabs in Sounds. However, I accidently deleted it in Sounds --> Playback when I was trying to troubleshoot why I could not hear the narration in eLearing courses played over our intranet through the headset. I meant to only change the settings so I could make the Speaker/HP the default device. BIG MISTAKE because now I cannot get it reinstall and show up in the Playback and Recording tabs.
- Have you checked plugging the headset to any other computer, does that work on other computers? Answer: The only other computer I have is an Apple MacBook Pro. I plugged the USB connector to that PC and appear to work although I cannot do a one-to-one comparison.
- You mentioned that Windows started to install the drivers automatically after you plugged the headset and restarted the computer after removing sound, video and game controller, was the driver installed successfully? Answer: Yes but it just does not show up any longer in as an option in the Playback or Recording tabs.
- Do other audio devices work fine on this computer? The only other device is the computer speakers and they work fine.
Regarding Method 1. I had already installed and ran the MicrosoftFixit.Devices.exe file you provided although I ran it again and this did not fix the problem.
Regarding Method 2. I checked and Show Disabled Devices is checked. The only other devices in Playback and Recording are Speaker/HP and Realtek HD Audio 2nd output.
UPDATE!! I removed the headset USB connector and plugged it into the MAC, then removed it from the MAC and plugged it into the PC, voila! The headset now shows up as an option in the Playback and Recording tabs. Yeah! I was able to select it and set it as the default device, tested the VoIP phone and it all works!! Whew! I was about to give up on the VoIP phone. Thanks.