Game / PC Crash after queue

Hey there!

Since i patched yesterday night fo 8.15, i am unable to play any gamemode in LOL. After the whole Champ-Select / Countdown my Pc instantly reboots and in am unable to join the game in time to not get busted for leaver / afk. After rebooting i get the Windows7 notification: Bluescreen. This occured twice in normal (Blind) games and since i did not want to bother other people i tryed it now several times (3 or 4 times) in Custom games (No other players, no KI). Before patching i had no such issues whatsoever. Funny thing is that after rebooting the client lost who i am (i ticked the box: "remember me") and my region (EUW) and i am always set to NA.

Also tried to "initiate full repair" twice now. Same story as above. Since i run LOL on my Pc for several years now i dont think that it should be a hardware driver issue. What to do?