This is a real stumper!
Get back to the "Playback devices" as you did earlier and right click the displayed speakers.
Select Properties and a new Window will open.
Go to the General Tab
You will see an area titled Controller Information with a Properties Button.
Click the Properties Button and see if you get a Message saying "This Device is working properly"
Do this for both Speaker icons shown.
Find which one is not working properly and try again to update the drivers right from there.
If that is a BUST which it may well be you'll have to go Back to Control Panel > Device Manager > Sound > Sound, Video and game controllers,
Go to the 2 entries for "High Definition Audio Device".
Right click the one with an exclamation mark.
and click UNINSTALL it will ask if you want to Uninstall the driver as well and select that as well.
See if you can play sounds now.
If no sound go back to Control Panel > Device Manager
Go to the Top Menu Bar and Select Action
Then select "Scan for Hardware changes" and see if the Audio Device is relocated.and installed.
If it finds the Audio Device, recheck under Sound, Video and game controllers in the Device Manager and see that they no longer have an exclamation point.
If you do get exclamation point again just UNINSTALL Both Audio Entries and then do the Scan for Hardware Changes from the Action Menu Bar item.
Hopefully one of these will work..