When I first installed Windows 7 Pro 64-bit a few weeks ago, everything was working. Now, when I try to use the "Play All" or "Play Selected" buttons in Windows Explorer for My Music, nothing happens. I've tried refreshing the default folder settings and that didn't work. Media Player is my default player and when I pick an individual song it opens properly. Similarly, if I "Select All" and then choose "Play" from the context menu that works as well. Just not the button on the menu bar in Windows Explorer. How do I fix this?