Originally Posted by Stream Recorder

Some content providers force you to upgrade your WMP. There is nothing you can do about it.

I duno whether WMP11 forces you to upgrade or not. But you can see people using WMP9 with IBX 11.0.6000.6324.

If your IBX is not supported, you can wait until the newest version of lossless DRM removal software starts supporting it. Or you can use a clean system and allow selective updates only (avoiding the ones that ugrade IBX). Alternatively you can use lossy DRM removal tools.