Is there a brown speaker down on task bar that is the audio manager? If so, thats good, but right click the white speaker for the regular volume control then choose playback settings, right click anywhere in the empty space of that box and make sure "show disabled, and also show disconnected devices" are checked.
What you see may differ from what is shown below. You might have to play around with it in order to complete the next steps. The best way to do this: If you have music on your pc, open up your media player. Choose something to play, let it play. If you don't have music on your pc, use a music cd if you have one.
After you check show disabled and disconnected devices, RIGHT click on your audio device. In my case, it's Realtek. If Realtek is enabled I don't hear anything. When I DISABLE it, sound returns.
If it's ENABLED, disable it. At this point, do you hear the music?
I spent 2 days trying to figure out how to get sound on my new Win7 system. When nothing worked, I admitted defeat and emailed a friend in Canada. He is the one who gave me what I mentioned in my first sentence above. He also stated "just remember i spent weeks, with lots of Rum to knock this out". Hope this works for you, minus the rum.
Edited by Queen-Evie, 27 December 2010 - 11:30 AM.