T4 not working on launch

[AyKAy]

when i launch t4 zombies i can only hear the menu music and it only shows the bin window, and when i open t4 multiplayer it shows a black screen and plays the menu music. idk what is causing the problem because i was playing them last week just fine. i just want to play some zombies bruh

[Xerxes]

Change the game to windowed mode through the external console.