Audio Driver for Macbook Pro 2.2 GHz running XP

I made the insanely stupid mistake of deleting my sigmatel audio driver the other day while trying to free up space, so I don't have any sound on my windows partition now.

I don't have access to any OSX cd's save my own 10.4 discs to replace the driver.
I've found simgmatel drivers to download for a few other systems, but which driver should I be looking for?

I'm using a 15-inch 2.2GHz MacBook Pro from 2007.