Fozzie told me how to get rid of Nero. Since that's not your question, I will refer you to a magic program, formerly called "crap cleaner" and now sanitized and called "Ccleaner".
Download install and update http://www.ccleaner.com
Attention : the installation package comes with the Yahoo toolbar
if you do not want that you have to, untick the box accepting it during installation process.
After installing and updating go to options - advanced and tick prompt for registry back ups
Do two runs Analyze then Fix
There are 4 options in this wonderful little program, and it gives you a list of programs it can delete.
Suggest you read the tutorial (I didn't, Fozzie gave me great instructions) about Ccleaner, unless you are the curious type that's willing to just hit the buttons. So far, I have found it safe to do the "cleanups". Good luck; I am not sure it will undo Yahoo, but it's sure nice for cleaning up the