LOL! Well, it was an issue with the MS Framework .NET 1.1. :-) We tried just uninstalling that and reinstalling, but it didn't work. Had to back up his data file to the desktop, uninstall the whole program piece by piece, reinstall, restore the data file, and remap the program to find the lessons which were previously installed. Not a big deal in the end, just time consuming and - for someone like me who is paranoid of doing the wrong thing and screwing it up royally - a bit nervewracking! :-)