Penumbra: Overture crash. OpenAL

[Ramsey]

I seem to have a problem with my Penumbra: Overture. For some reason, starting this morning, I cannot successfully start the game up. When I click it, the screen goes black, blinks back to the desktop, black again, and then it crashes with the error message:

FATAL ERROR:
Failed!Check your OpenAL installation.

Then nothing, I press okay and that's it. I tried installing OpenAL, that did nothing, so what do I do? I run a Windows Vista, NVIDIA GeForce 9600 GT, and run the game off of Steam. Please help me.