1.) MP3Rocket has risen to popularity because it does not attempt to filter pirated (illegally-shared) music, unlike some others have begun doing. Thus, I'd suggest switching to an alternative that works as you desire and that does not so easily facilitate accidental piracy.

2.) You cannot downgrade to an earlier version of WMP under Windows 7. The pre-installed version under the version of Windows is always the lowest version you can revert to.

3.) The program may have to be updated for full Windows 7 compatibility to work. It's up to the developers to support that.