The error may be caused by a missing file or a bug. Try to reinstall the application and then to remove it using the standard method. If it doesn't work, uninstall the utility using Revo Uninstaller, IObit Uninstaller, or Absolute Uninstaller. All of these tools are free of charge and will force netDeploy Global Enterprise Client to uninstall, by wiping out all traces of its presence from the system.
After that, try running AdwCleaner to make sure that there are no leftover rogue registry keys or toolbars in your system.