No problem Jim!

Words don't easily imply tone. That's what the smilies are for.
As I said Jim, it is not drivers but I think it is the LAV codecs having a conflict. Codecs are sound processing additions that allow an o/s and its default media player to play specific file types that are unknown to the host os.
Examples would be: .flv, .aac &c
To play these you need a codec. Codecs tend to come in packs to allow the os embedded player (in this case WMP) to play a variety of unknown file types. All media players have/use codecs, some come bundled with a lot built-in, there are always 'alien' types that need new codecs.
A codec intercepts any sounds played and does some processing on the sounds. Codecs are VERY common, especially when it comes to WMP, and as we are talking Xwidgets then it is WMP alone we concern ourselves with here.
The bundle I am using is the most popular, the LAV bundle.
The important thing to note here is that if Xwidget is having a problem with these codecs then it is very likely to be affecting a LOT of potential users as they are widely used.
PS Jim, the Brits use sarcasm a lot and we expect others to just 'get it'. I will have to remember that.