Ok i've not fix it. I will try and describe my problem again.
For the most part, audio playback is fine, but when audio features are first used (for example when the windows startup sound plays, or when any other windows sounds play) the beginning part of the sound is clipped of, and playback finally begins part way through the audio file. Its like the sound can't get there fast enough to play incidental audio sounds. (I'm trying my best to describe this issue and I hope I'm getting the gist across, please ask me 20 questions if you aren't certain what I'm talking about).