Okay, since you seem not to be happy with a player that can play almost any file without problem, I guess you deserve the WMP.....
Go to any media file you do not want VLC to start. Right click on it and choose "Open with..." and then "Choose Program...".
From there you choose your elitist WMP......there will be a small square to mark so that your wonder-player will always open those file types when clicked....
