BTW, thanks very much for taking the time to help me. I really appreciate it. I use sound a lot on my PC: websites, youtube, news, video, skype, webcam. Without it is very debilitating.
I've followed your directions PRECISELY.
What's confusing is that my computer seems to disagree with itself. It says this driver
is the correct driver. The driver installs successfully.
But I still get this message: No audio output device installed
When I click that speakerX icon, Troubleshooting launches, but it can't identify the problem:
And DriverDetective concurs that the correct, up-to-date driver is in fact installed.
I am left perplexed. Here's further information which might bear on the subject. I used this OS file to install, and perhaps it's leading to some of these issues:
Windows 7 Ultimate x64 OEM (Dell) Pre Activated
One other point: Prior to my Windows 7 update, I installed Kubuntu (Ubuntu with KDE interface) dual boot, and with Kubuntu the sound seems to be working fine (except for a known issue I have yet to address concerning Flash plugin sound). Just thought it might bear on the situation.
Any further ideas?