Compil error

Mit Excel er pludselig begyndt - når jeg åbner eller lukker programmet - at vise følgende: Compile error in hidden module: Distmon.
Når jeg klikker hjælp, får jeg følgende for mig uforståelige 'forklaring':


Compile error in hidden module: <module name>
A protected module can't be displayed. This error has the following cause and solution:
There is a compilation error in the code of the specified module, but it can't be displayed because the project is protected.
Unprotect the project, and then run the code again to view the error.
For additional information, select the item in question and press F1(in Windows) or HELP (on the Macintosh).