Most likely problem is with DWMAPI.DLL file that is designed for Vista and under XP it provides that error.
Locate and delete/rename DWMAPI.DLL in windows\system32 folder after restart you should not receive that error.
EDIT: Issue is most likely related to some IE7+ extensions/toolbars
EDIT 2: I knew that I already solved that issue See http://www.mediamonkey.com/support/inde ... icleid=122
Get answers about using the current release of MediaMonkey for Windows.