a critical error ?
C:\Users\BABYNA~1\AppData\Local\Temp\PKM1D1C.tmp
C:\Users\BABYNA~1\AppData\Local\Temp\PKM1D1C.tmp
Are you running WinXP by any chance? A lot of other users (including me) have the same problem since last patch. If so can you please check if you run Service pack 3. If you run SP3 create a Ticket so Riot is aware of this Problem.
Could not join game created dump file