I don't see him starting the mission editor anywhere.
It looks like he first started the game, pressed query master, joined a server, left, joined another server, downloaded a few things, and then crashed after the mission was lit.
I'm guessing its probably something to do with outdated drivers, have you updated your drivers yet? Have you ever been able to play before, or did this just start happening? Have you downloaded any mods between when you could play and now? Have you changed any system hardware?
If you haven't updated your drivers, then follow the steps here:
http://blockland.us/driverUpdate/index.html.