When opening ArcMap, the following pop-up error message appears:
"Cannot run Unicode version of ATL71.DLL on Windows 95, Windows 98 or Windows ME. Please install the ANSI version."
For ArcGIS Desktop 9.3 the following message may appear after closing ArcMap:
"ArcGIS Desktop has encountered a serious application error..."
The ArcMap compatibility is set to run as one of the operating systems listed in the error message.