I installed the nVidia drivers. The speakers work.
I have two basic desktop speakers. When I set the nVidia control panel to 4 or 6 speakers and plug my 2 speakers into the rear channel I get sound on CDs. I don't get any Windows sounds. I guess Windows sounds don't have a rear channel component.
So it seems that there may be a problem with the jack for the left and right. I am downloading new drivers and will try that.
Thanks for your help.
<font color=red>The solution may be obvious, but I can't see it for the smoke coming off my processor.</font color=red>