No Web Browser sound, but I do have the regular System Sounds

I have an Inspiron 15 N5010, with Windows7 Home Premium (svc pack 1).  The Internet Explorer 11 browser seemed unstable so at one time I had installed Chrome.  A few weeks ago it seems I lost sound in both web browsers completely, but I still have system sounds, and itunes audio as well.  I have since uninstalled Chrome and am just trying to stick with one browser thinking that maybe that was the issue.

I ran a DirectX Diagnostic, which suggested that I did not have a sound card.  However, in my sound mixer the IDT High Definition Audio CODEC appeared.  I ran tests and could always hear the sound.

I completely uninstalled the driver and deleted all of the old files, and reinstalled/updated it.  When I ran another Direct X it did show a sound card.  But, unfortunately I still don't have any sound in Internet Explorer. 

I have confirmed all the sliders are up, nothing is muted, and I have checked that all of the internet advanced options allow web sounds, etc.  All scans, disk checks, system checks reflect that the device is functional.  And it seems to be- because I hear the start up sounds, etc.

I don't use the Windows Media Player, but I did try that, and it is non-operational as well saying there is an error with the sound.

Something in that soundcard seems to be having issues, but it has not completely failed.

I have been struggling with this for days.  Any other suggestions to try to get the web browser sound functional again??  Thanks!