Bug splat

so when i open the client and go on the login in menu, when it gets to the login in menu i just get a bug splat and than the game opens again and does other bug splat and it keeps on doing that, it was working fine yesterday but today is just not letting me even get on the client, i done nothing with my pc as well i tried reinstall it, didn't work so im stuck now plz help me. sorry for bad English