Hi and Welcome to Just Answer,
Ok we can take a look at this, and get you back and running.
Let's start here
Go to Start-> shut down-> Reboot
Reboot your computer, F8 safe mode
Start->Control Panel->System-> System->Hardware->Device Manager->Sound, Video and game Controls Plus symbol.
Write down the names in the area, Just incase the drivers can't be found.
Uninstall all the devices, some may be tied in to others, and as you uninstall them it will remove the others.
The Sound devices should reinstall and you should be up and running.
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If there is anything else let me know, If not click accept. Thank You Michael L.