same here
and I saw comment form NA player 14 days ago with the same issue. as I understood from dozen+ threads this is the issue of an anti-chit system that Rito started to implement on NA 2 weeks ago, and on EUW it was started with VS event 2 days ago. as this system starts to work it randomly crash ability to play LoL to some of us. sometimes they say it's about an anty virus. but I don't have any at all but have the issue. as I saw from NA comments Rito didn't do anything and those of MINORITY who got this lethal bug still are unable to play LoL, 14 days after it started. and who knows, maybe we will not be able to play ever again.
PS: or just go out and get a new PC! maybe it helps. no guaranty though.