Windows media player 11 offers you great ways to store and enjoy all your music, video and pictures along with its new cool look.However if you do not have a geniune pack of windows service pack 2 you will not be able to run and install windows media player.I have already posted article on How to make windows xp geniune.
Here are the steps to Install windows media player 11 in priated windows

1. Download Windows Media Player 11.0 (make sure its the final and latest version, not beta) from the Microsoft Site.
2. Extract the downloaded Windows Media Player setup file (wmp11-windowsxp-x86-enu.exe) using WinRAR to a directory (wmp11-windowsxp-x86-enu). Now make sure you have a “LegitLibM.dll” file in the extracted “wmp11-windowsxp-x86-enu” folder.

3.Download the patched LegitLibM.dll and then copy-paste it to the “wmp11-windowsxp-x86-enu” folder and click yes when asked to overwrite.


4. Now run “setup_wm.exe” file in the “wmp11-windowsxp-x86-enu” folder.
 5.Restart your PC, then run your Windows Media Player and you are done!