How do I uninstall the 777? I do not see anything in add/remove.

It should be in the Add/Remove Programs (Programs and Features) if it has been installed, however there are other ways to uninstall it:

In Windows XP/Vista/Windows 7, look in the Menu > All Programs > Captain Sim > 777 Captain (FSX)/777 Captain (FSX-SE)/777 Captain (Prepar3D v3) > 777-200 Base Pack > Uninstall.

In Windows 10, and I think Windows 8/8.1, go to the Menu > Captain Sim > Uninstall (it will be a red and white icon displaying 777 above the Captain Sim logo).

If you have trouble with the above, look in the root folder of the sim program for:

csx772_uninstall.exe for FSX/FSX:SE version
csz772_uninstall.exe for P3Dv3 version

Note 1. The .exe is most likely hidden, so you will only see csx772_uninstall, or csz772_uninstall in the root folder of the sim program.

Note 2. I use Classic Shell so that the Start Menu in Windows 10 is like the Start Menu in Windows 7!  ;)