Overture won't install OpenAL

[darcy]

When I try to install overture, the set up goes fine until the part where it tries to install OpenAL. I get a pop up message that says "Unable to execute file: C:\Program Files\Penumbra\Episode 1\installtion\oalinst.exe
CreateProcess failed; code 740.
The requested operation requires elevation."

And then when I try to play Overture it says: "This application has failed to start because OpenAL32.dll was not found. Re-installing the application may fix this problem."

I've tried re-installing several times with no luck. Any help is appreciated. I'm a complete noob with technical stuff too, so I'm sorry if there is a really obvious solution I'm missing.