Exactly what the title says. It quits at the exact moment it displays fullscreen, even syncing and displaying ads. I've tried reinstalling and disabling background processes, and I believe I have DirectX 9 installed, but nothing works.
Also, I am completely unable to install Xbox 360 controllers, my computer is outright refusing to detect it as a valid object. I have tried every USB slot on the computer. Any ideas?
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Everypony's digging with a shovel
I don't know about the Xbox controllers, but try and go to steam library (I'm assuming this'll work since it's a source game, but portal 2 seems to do things differently sometimes), right click portal 2 > properties > set launch options
type -windowed -w WIDTH -h HEIGHT -novid
What this'll do is make it start windowed instead of fullscreen and not display the little boot animation that source games have. Set width to your preferred width, same for height.
If you still experience crashing, it could be directx, so try adding -dxlevel 81
That'll set the game to DirectX 8.1.
I'm not sure if these'll work on portal 2 at all, but it's worth a shot.