Napolion

i have a problem , when i install league of legends in my pc ,my pc freez as a whole and even when i restart my pc it corrupt ,so i have to run my pc in save mode and remove league of legends so it can restart and work well agien , and when i try to install it agien ,the same problem occurs windows 7 6 Giga Ram vidio card, ndvida Geforce Gt 610 processor ,intel core 2duo 2.66 Ghz ,2.67 Ghz help pls.