Erm, well it was working fine yesterday, and it's the /worst/ ever time for this to happen to me. Seeing as I'm no Tech guy, I'll rep whoever can help me c: And no, I can't reinstall it seeing as it's a student edition and I have to have a serial code :/
What I can find so far: Either reinstall CS4 or try do download the DLL from the net (google aif_ogl.dll + download).
So ??? Is it working or not ? Let us know. Some members or someone might be googling for the same problem and I'm sure he'll be happy to find a solution !