[CRASH} Client exiting after each game.

When I finish a game of LOL after victory or defeat, my game quits. This is very annoying as I cant compare my game stats with others or see who was buying what items in a game, or even just chat with my teammates after a game.

Also another technical problem I have that might be related, every time I try to launch LOL I get the message "Another instance of the launcher is running. Do you want to terminate it?" When I click Ok the game launches as normal.

I have tried reinstalling the program and that did not fix it, any other ideas?