After the 737NGX loads into a scenery I get an error message saying "The module "E\Program Files\Microsoft Flight Simulator X\Modules\GNSSXch1 & GNSSXch2 may not be compatible with the version of Windows that you are running. Check if the module is compatible with an x86 or x64 version of regsvr32.exe

I have no such dll files in my FSX setup. Are you sure that these are PMDG dll files?

Not positive but there is a progam that registers dll's I did run into this before, after the reg of the dll all was fine but dont quote me on this Rich