League of legends just uninstalled itself on me while going into a game

Awesome random event, just patched the client for the most recent update, loaded the game up and searched for a match. I went all the way through champ select and the match starts. As soon as the client closes to boot up the game and start loading it, it crashes and says lollauncher.exe not found. Turns out it uninstalled itself! I go to my directory and all the files are still there except the .exe files, so i go to try repairing it and my only option is to unintall it, at this point thats all i can do, so i TRY to uninstall it, but it says it can't, because it DOES NOT EXIST. So I restart my pc, reboot LoL and there's a 4GB update. Awesome. Wtf happened.

Update The 4GB patch just finished and when I hit launch i get this>> "Possible data corruption detected" "Sorry! We've detected some possible data corruption in your installation. Would you like to repair the affected files?" -.-

After completing this the launcher comes up, I hit launch, the client closes, nothing happens but occasional Bug Splat errors...