Latest questions about "start up"

The game doesn't start up when clicking the icon on the desktop. The League of Legends logo is displayed, then the screen flashes and it goes away as if it never started.

Every time I try to install the app, it asks for a password after starting up and then whatever I enter it says: invalid password and it doesn't run anymore.

The RCA Easy Rip, RCA Detective and Update has been removed / uninstalled from my computer, but I keep getting the message "easyUIstringConfig.