OpenAL sound device and driver

[mono16]

My software uses OpenAL and it runs fine on most PCs but on vista in Parallels 7 (Mac Book Air), it fails to find any device.
Specifically, this line returns NULL:

device = alcOpenDevice(NULL);

I've tried both "parallels audio controller" and "Intel sound driver", none of them fixes this issue.
Is there a 3rd party sound driver that works with OpenAL and vista in parallels that will remedy this issue.

Thanks,

[mono16]

To answer my own question, must deploy OpenAL redistributable which falls back to a software-based OpenAL device to play sound, if it couldn't find any compatible hardware device.