You have to open up explorer and click on view/folder options. Click the 'file types' tab and scroll till you see the .mp3 or the .wma extension. You might have to click on where it says Real One Player instead. Click 'edit'. Where it says something like 'open' click that, click edit, and browse till you see what program (WMP) that you want to open it with. Retype where it says "Description of type" to Windows Media File or something like that, change the icon, that should do it.