Windows Media Player 11 is constantly monitoring several folders in the My Documents folder structure for media changes. If you do not use WMP 11 as your main media player you might be wasting resources caused by this monitoring. By default the My Music, My Pictures and My Videos folders are monitored and new files are automatically added to the Windows Media Player 11 library.
Install Windows Media Player 11 without WGA check
This trick is not working anymore and has therefor been removed from the server.
The best way to install Windows Media Player 11 is to download it from an official download parter such as Softpedia and install it that way.
I prefer to use alternatives like the excellent SMPlayer which can play most formats without [...]
Download Windows Media Player 11 Beta
In case you are using the windows media player you probably would like to take a look at the upcoming media player 11 by downloading a beta version of it. The download is available right from the microsoft homepage. I found a list of the new features, not sure if it is correct though:

