i wasn't able to playback mp3s or videos in the 64 bit version of WMP even though the 32 bit version was working fine. it would start and when i would click on in mp3 in my library i would get the dialog box that WMP is not working as it faded.
tried the DRM fix, but had no files in the directory. then in the advance options menu i unchecked anything to do with checking file information on the internet; it loads faster. but for some reason i ran it as an administrator and viola, it started working! i now don't need to run as admin and it is still working. don't know why and sort of don't care, maybe someone more knowledgable than me knows. just happy its working.
maybe this will help someone.