Penumbra: Overture crashes computer

[Agent 1337]

If I recall correctly, I had this same problem with the Steam version of Deus Ex. I have a horrible and old computer that has many problems and crashes for no reason when launching some programs. Well, when I try to launch Penumbra: Overture with Steam, my computer freezes up. The game doesn't launch, but I can still move my mouse and sometimes even click things, but nothing will ever happen. Task manager doesn't even show up. And it will stay like this indefinitely, so I have to press and hold my power button. Please help!