Try using the Microsoft FixIt Utility to ensure Garmin Express is completely uninstalled. This software is third-party and not created by Garmin. The software is licensed and created by Microsoft.
1.Go to the web page: http://support.microsoft.com/mats/program_install_and_uninstall/
2.Click the Run now button
3.Click Run in Internet Explorer or download then open MicrosoftFixit.ProgramInstallUninstall.RNP.Run.exe1
4.Click Accept in the license agreement
5.Follow the provided instructions to select and uninstall the particular application
When uninstalling Garmin Express select:
•Garmin Express
•Garmin Express Tray
•Elevated Installer
•Garmin Update Services (skip if not present)
•ANT Drivers Installer x64
This program will need to be run again for each item on the list to be uninstalled.
Then install Garmin Express directly from http://download.garmin.com/omt/express/B/GarminExpressInstaller.exe