I have no idea what this message means. It doesn't LOOK like Windows actually changes anything when I get it (I checked the Compatibility Settings, and they don't seem to have changed), but it's something of a mystery. (Running on Win 7 x64.)
So far, I think I've only seen it three times, but it seems to appear completely randomly, and only while shutting down C3D. So I think it's innocuous, but not sure.