i can't play 1.7.x more... by that I played two days 1.8.x who can help my?

I play often between 1.7.5 / 1.7.10 and 1.8.x but after 2 days only on 1.8.x play Chrast my mc if I want to play .... 1.7.x've java again updated but unfortunately ,.,,,,, who can help me?