Help me please

[Rami0]

when I start up bo2 zombies in the launcher it goes to a black screen and kicks me out. All I can hear is the sound and I can not see the screen.

[HannesC]

Type r_fullscreen 0 and vid_restart into the bootstrapper cmd window and try alt tabbing into the game again.

[Rami0]

HannesC thnaks