When MapViewer is installed, several original source files are copied to a directory on your hard drive. These files are necessary to uninstall the software. If these files are deleted, the software cannot be uninstalled. To uninstall MapViewer, reinstall the previous version, then go through the uninstall process using the Control Panel.
If uninstalling via the Control Panel tells you the install/uninstall failed, try running the Microsoft FixIt program to get the program uninstalled.
Updated March 20, 2018