I recently had a problem with Garmin Express launching past the splash screen. After multiple uninstalls & reinstalls i tried this...
Uninstalled Garmin Express
Search for %localappdata%
Open Folder
Deleted both Garmin related folders
Rebooted
Reinstalled Garmin Express
Garmin Express now opens correctly
Apparently Garmin Express has a glitch in their uninstall process...
Hope this helps.