[jakejohnsonusa]

Do this:
Start --> Devices and Printers
Right Click anywhere in the window --> Device Manager
Click the "Sound, video, and game controllers"
Double click on all (Usually two) Audio device systems

-Under the general tab of those windows you should get the "Device Status" What are you devices statuses?
-Under the Driver Tab make sure the device's aren't Disabled, maybe attampt to Update it again (then Restart PC)

Post the "Device Status" Your problem could also be caused by some type of virus...

-jakejohnsonusa