Overture: "Failed! Check your OpenAL installation."

[Saeyr]

I just got this game last night via the Humble Bundle deal. When I go to run the game, the screen goes completely black until I control+alt+delete out of it. There's an error message that pops up with the text in the title, even though I selected the option for installing OpenAL in Overture's installer. I've tried installing the OpenAL dll through their website as well, but it just gives the same error. The graphics card in my laptop is the ATI Mobility Radeon HD 3400 Series.