Just so I'm clear, you saw the screenshot attached to your first post about this error when you tried to run the .exp and .que file you also attached to the first post?

Is the MediaLab program folder itself installed on the hard drive of the computer or on a networked drive? MediaLab generally works when it is installed directly onto the hard drive of the computer.

Have there been any major changes in the software and/or hardware on this computer before this error occurred?

Are there any message boxes or warnings that pop up when you get this malfunction?