I am trying to use the IDL DICOM Network Services. But, I meet a curious error, like this : IDL> a = OBJ_NEW('IDLffDICOMEx') % OBJ_NEW: Error: MC_Library_Initialization failed , Invalid configuration parameter % Dynamically loadable module failed to load: DICOMEX. I know that this class needs arguments, but the error is not related with arguments, I think. IDLffDICOM class has no problem. IDL> a = OBJ_NEW('IDLffDICOM') % Loaded DLM: DICOM. I can use IDLffDICOMEx on other system of mine. So, I formatted my system and reinstall IDL 7.0. But the results are the same. It doesn't work on my desktop. Could you help me?