I get a hidden window when closing this something new to me, started right after I watched a full length TV show. Is this normal? Should I be concerned about it?

Not really sure what you are describing.
What is meant by hidden window?

Have you restarted PC since this started and has happened again?

MusicMatch has been dead for a number of years, why do you mention it?

I got an answer in another forum somewhere that said it only happens in musicmatch and I don't even know what it is but the window showed up right after I watched a TV program online so thought it might be connected somehow

Download and install hijackthis.exe (http://go.trendmicro.com/free-tools/hijackthis/beta/HijackThis.msi) Do a quick scan, and post the log results, but don't fix anything until someone else has looked at the log.

Download and install hijackthis.exe (http://go.trendmicro.com/free-tools/hijackthis/beta/HijackThis.msi) Do a quick scan, and post the log results, but don't fix anything until someone else has looked at the log.
Will you be analyzing his log entries?

I will... if no one else does before I get to it...

It's a potentially lengthy affair at times to guide someone through that, as well analyzing the entries in that long log takes an experienced touch. I don't have the patience for it. :)

I've been using the program for over a year with no casulties. I am willing to sift through it.