From the
Mozilla website:
Type about:plugins into the location bar. There should be an entry for Windows Media Player Plug-in Dynamic Link Library (File name: npdsplay.dll) and two entries for Microsoft® DRM (File name: npdrmv2.dll and File name: npwmsdrm.dll).
If some or all of the files are missing, you can download the individual files from dlldump.com and place them in the Windows Media Player directory (usually C:\Program Files\Windows Media Player):
npdsplay.dll: http://www.dlldump.com/download-dll-files_new.php/dllfiles/N/npdsplay.dll/3.0.2.629/
npwmsdrm.dll: http://www.dlldump.com/download-dll-files_new.php/dllfiles/N/npwmsdrm.dll/9.00.00.3250/
npdrmv2.dll: http://www.dlldump.com/download-dll-files_new.php/dllfiles/N/npdrmv2.dll/9.00.00.32508/
I have a feeling if you were actually here you could solve the problem. Unfortunately, I look at the information you have posted and my head spins.
My "about" has npdsplay.dll, but it doesn't have one Microsoft® DRM, much less two.
::Sigh:: Looks like I'll be using my IE browser a lot more than I used to.