I start the program and as soon as I move the mouse over a function the message "An invalid argument was encountered". Does anyone know how to fix this because I cannot use the program?

Just a thought: did you play around with your set of skin files? When you move the mouse over one of the buttons, MM tries to grab graphic info from one of those files in your MM directory ... could that be the reason? I think there must be five files starting with "skin" in that directory (usually C:\program files\MixMeister).

BTW, what is version "7 melody"? The latest release of Fusion is 7.2.2 -- is that what you are using?

The version is Fusion 7.2.2 & I did not mess with the skins. I was reading other articles about this error and some were talking about Nero Burn Rights. Does anyone know if that may be it. Because I installed Nero about the time it started doing that.

Why not uninstall Nero and see what happens?

I did uninstall nero and then restarted. Still same problem

Sounds like something for Tech Support. I've got no clue...