Remove Nero 7's "Nero Scout" from My Computer

This does not get rid of the tray icon. This only gets rid of the icon in My Computer. You should be able to right-click on the tray icon and disable that version of scout from there.

Click Start > Run, and type:
regsvr32 /u "%commonprogramfiles%\Ahead\Lib\MediaLibraryNSE.dll"

To undo (put it back) :
regsvr32 "%commonprogramfiles%\Ahead\Lib\MediaLibraryNSE.dll"

This will not cause any harm.

A wiki page has been created, which contains multiple fun DLL registrations, including this one.