Required Dependency Missing
I've been facing this issue for months on end now with no fix, I've tried restarting my PC multiple times, retrying, uninstalling vanguard, uninstalling the game, uninstalling the riot client, etc and even manually allowing the vgc service to run at startup and still doesn't work, i refuse to open a ticket with riot as in my previous experience are extremely unhelpful and take an outrageously long time to respond.
Solution
Close vanguard in the system tray then open cmd as admin and enter:
sc delete vgc
&
sc delete vgk
sc delete vgc
&
sc delete vgk
