Click start and type into start search Device Manager. This will list your hardware. Look for sound,video,game controlers you probably have some yellow !!!! marks under the stuff missing drivers.
You may need to dig out your motherboards orginal cd for those drivers if you got onboard sound. OR the sound cards cd. Better yet get fresh drivers online for all your hardware in vista form..
Licenced HVAC TECH: "Without seeing your problem i can only offer suggestions, no warranty is included with my advice"