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#11
It might still be worth a try to uninstall the current version and then install 0.4. I also have that plug-in installed on a Windows 7 system and it's not causing WMP to start up in Now Playing mode, so are you sure that it wasn't just the Replay Media Catcher plug-in?
The only other lyrics plug-in that I know of is MiniLyrics. Alternatively, you could add the lyrics manually and use WMP's built-in function for displaying lyrics.