Now to the ultimate question: Does Riot Vanguard actually get effective at detecting cheaters and getting rid of them? The simple answer is yes; it is effective against cheaters. In fact, it is one of the best anti-cheat programs out there in modern FPS games.
Head to your taskbar and click on the chevron. Then right-click on the Riot Vanguard logo and click Exit Vanguard. Alternatively, you can also uninstall and reinstall Riot Vanguard to potentially fix any problems you might be facing with it as well.