DLL errors

[Dominique]

Hello,
sorry for my English,
I bought Milviz 310R, and installed TDS GTNXi 750.
I launched TDS GPS Manager and  installed GTNXi PC trainer and TDS GTNXi.
In Garmin aviation trainer I selected multi engine turboprop.
Navigators - GNTXi (V20.20) - display (nothing) and Power on.
A full of messages errors - 
failed to load iop_b.dll getlasterror 126
iop_c.dll, iop_d.dll, iop_com.dll, iop_nav.dll, nav_main.dll......ETC all DLL with getlasterror 126.

Help me please