MCE Remote Buttons Don’t Work

I’ve been using my RC1804912/06 remote for a couple of years, but have never gotten three buttons to work (even though the light on the remote flashes when I press them). This is a picture of my remote and IR receiver.

I’m using the RC6 custom registry setup from http://xbmccustomregis.sourceforge.net which activated the majority of the buttons and I used AdvancedMCERemoteMapper to remap the functioning button.
I’ve used showkey to verify that windows doesn’t see the 3 non-working buttons, which are the button to the left of the silver directional square, the silver button at the top of the directional square, and the button at the top-right of the remote. The buttons do show up in EventGhost (which I don’t use for navigating around Kodi) and EG gives them these values – 7B90, 7B7F, 7B7E.
I’m fairly certain my problem is in the registry for my remote (745a17a0-74d3-11d0-b6fe-00a0c90f57da), but have been unable to add these buttons. Any help in this matter would be greatly appreciated.

Kodi 15-1
Windows 7 SP1 64-bit
AMD E-350 Zacate
4GB Ram
Remote – RC1804912/06
IR Receiver – OVU400102/71