M$ does allow you to downgrade WMP, but downgrading IBX is no longer possible. Even if you re-individualize your computer, you get the latest version of IBX. And althout drmdbg support IBX 11.0.6001.8015, it is not supported by the latest versions of freeme2 and FairUse4WM.

You can still use lossy DRM removal software as well as screen video capture software and direct sound recording software.