Yesterday i started RepCom and suddenly i got kicked from the server and got this bluescreen:

My PC froze. I resetted the Notebook and restarted. The typical window opened how i wish to restart the PC. I started the notebook the normal way and it worked.
I wanted to know if it was RepCom and launched the game.
The same happened again. PC froze and i got the bluescreen.
Now i can only boot the notebook in safety mode (abgesicherter Modus).
And always i want to boot i see blue stribes in the screen.
Looks like this:

Any suggestions?
Edit: I launch all my games from an extern hard disc.