Deluxe Error Problem

[Lubang]

Encountered a problem whether there is a solution?
Error: DirectDraw received a pointer that was an invalid DIRECTDRAW object.
File:L: \kelib\DirectDraw\DXDirect3D.cpp
Line:488

Error:another app has a higher priority level. preventing this call from succeeding.

Cannot find file
C:\Program Files\RealFlight\RFCOM\RFCOMCDVERIFY.ICD
Error opening DCK file


Error: D3DRMERR_BADDEVICE
File: L:\rcflight\Sim\Simulation\RCSim World.cpp
Line: 1185