Just sharing an interesting Areo Class.dll 'programming Error' with WMP11, Its understandable and good Microsoft has created a new WindowsMediaPlayer 12 for Windows 7 and Vista 
‘Interesting’ Transparency Effect on Vista WMP11 Window » My Digital Life
In Vista with Aero Transparency Glass effect enabled, the built-in Windows Media Player 11 (WMP11) has an interesting visual effect. The trick will make the whole window of WMP becomes transparent in a incredible coloring, including the some text and buttons.
To place WMP11 into such transparency effect, ensure that WMP is in “Now Playing” mode with NO media playing, and is not maximized.
Then, use mouse point to click and hold on the blank space of the control bar (faint white area) at the bottom of the Windows Media Player window.
Then, move the whole WMP 11 window upward to the top of the screen untill you cant see anything except the bottom of WMP. If you can’t move the window, make sure that the WMP window is not maximized, and you click and hold onto the correct area.
Once the window is on top (most part of window won’t visible as out of screen view), release the mouse button.
Watch the magic of Aero effect on Windows Media Player 11 window

‘Interesting’ Transparency Effect on Vista WMP11 Window » My Digital Life
In Vista with Aero Transparency Glass effect enabled, the built-in Windows Media Player 11 (WMP11) has an interesting visual effect. The trick will make the whole window of WMP becomes transparent in a incredible coloring, including the some text and buttons.
To place WMP11 into such transparency effect, ensure that WMP is in “Now Playing” mode with NO media playing, and is not maximized.
Then, use mouse point to click and hold on the blank space of the control bar (faint white area) at the bottom of the Windows Media Player window.
Then, move the whole WMP 11 window upward to the top of the screen untill you cant see anything except the bottom of WMP. If you can’t move the window, make sure that the WMP window is not maximized, and you click and hold onto the correct area.
Once the window is on top (most part of window won’t visible as out of screen view), release the mouse button.
Watch the magic of Aero effect on Windows Media Player 11 window

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