I have two sets of stereo speakers. Speakers on my desk and a pair of headphones.
The speakers are connected to a port on the back and the headphones are connected to a USB port on the front. (indicating this is a software issue)
Both devices only pick up the right channel. It's like windows is only playing mono sound and I can't figure out why.
Here is my advanced audio tab, if this means anything to you:

No options there for mono or stereo as indicated in this post
I don't think it's the driver. I didn't have any special drivers installed before, but once the problem started to really bother me I tried installing the latest version of the Realtek Audio Driver and it didn't fix it. I can't find any options to change it in the Realtek Audio Manager either.

Update: if I try to reconfigure the speakers and I select the output type as Stereo and then try to test it, I again get no sound when it's supposed to be playing through the left speaker and sound from both speakers when it's only supposed to be the right one.