I am running Windows XP with service pack 2 and also have Windows Media Player 11 version on my computer with Realtek audio card. After I upgraded the current audio driver the problem started. We have recently purchased some WMA files from some music download website and they were working fine. After that my computer crashed and hence I had to reinstall windows xp again. So, to get that songs again we went to that site but the songs were not downloadable anymore. When I tried to download them again the I got some error message that "There is a problem with Windows Media DRM in your computer, please email us or call us". So I emailed them and they gave me another url to download the songs again. But when I am trying to play the file then I am getting an error message that says "You've encountered error message C00D11B1 while using Windows Media Player. The following information might help you troubleshoot the issue." Any ideas?