Every good teammate shows up before the match starts, and Vanguard is no different. If you've enabled Vanguard Pre-Check, Vanguard is designed to launch on-demand when you start a Riot game instead of automatically when Windows starts. If you haven't, you need to make sure the vgc service starts with Windows by following these steps:

  1. Press Windows Key 🪟 + R
  2. Type services.msc and press Enter
  3. In the Services window, locate vgc
  4. Double-click vgc to open its properties
  5. Under Startup type, select Automatic
  6. If the Service status is Stopped, click Start
  7. Click Apply, then OK
  8. Restart your computer

Once your PC has restarted, launch the Riot Client and try starting your game again. Vanguard should now start automatically whenever Windows boots.