OK. I have slipstreamed SP3, WMP 11 and Hot fixes plus a several addons. My issue is that now, my Audio driver will no longer work. it installs and there is no issue shown in Device Manager. Is there a know conflict or any suggestions? I ahve done this a few times and think the issue is somewhere with SP3 or the slipstream of WMP11.

Is it HDA-capable?

If so, check for KB888111 (theoretically should be included in SP3 but you never know with MS...).