Downgrade Windows Media Player 12 to WMP 11 in Win 7

I need to get windows media player 11 on several computers at work that win 7 OS. Educational patient video clips can be played as a playlist on WMP 11, but in WMP12, only the first clip in the playlist will play, then the media player stops. This is known issue with WMP 12. I tried following instructions to do this from the Internet but crashed my laptop because the instructions had me moving and replacing system files. Instructions were poor and in the process I killed my windiws 7 OS. any help would be greatly appreciated. Thanks in advance.

 

Ps. I have Win 7 x64 home premium

 

From searching, apparently downgrading doesn't work on 64 bit windows 7.

But you can run WMP 11 in XP mode.
http://windows.microsoft.com/en-US/windows7/install-and-use-windows-xp-mode-in-windows-7

I found this but I suspect it only works in 32 bit versions
http://www.sevenforums.com/customiz...ndows-media-player-12-wmp-11-windows-7-a.html