Clean install of Windows... ran all of the updates.
Sound in Dev Mgr still not working, so I grabbed the Realtek AC97 drivers from a bunch of different sites.
Every time it tries to install it, portcls.sys blue screens!
Laptop worked fine before - prev hard drive's integrity was in doubt, machine was also infected badly with viruses.
I've gone to Realtek's and Lenovo's site for different drivers - no luck.
Also used Driver Detective - no luck with that, either.