RW Tools Error #76

I'm repainting a VRC GP40 and a GP40-2 for D&RGW (My first attempt at a repaint, no plans to upload it anywhere at the moment. PERSONAL USE ONLY!!)
Because some the of textures are "Scrambled", I read that I'll need RW Tools to view those textures.
When I open RW Tools and select "Open .TgPcDx Textures Files" and select any texture, I get the error #76 message.... (Screenshot of message enclosed)
According to Mike, this error occurs when the program is first run. I have never run RW Tools on my new computer!!
Mike says the registry entry is jacked. That I understand. He then goes on to say that it needs to be fixed and it will be necessary to use Regedit, and look for the entry.
Once in Regedit, I need to find something called "HKEY _CURRENT_USERand VBA Program Settings"
Well, I for the LIFE of me can't find it when I'm in Regedit........ I need to know where within the tree stricture of the files it is please.
I'm running Windows 10. The path to the sim for RW Tools is correct. I run it as administrator. The program was installed to the C drive direct. It's not in either the "Programs" or Program (x86) folders. It's all by itself on the C drive.