Vista - unable to access unknown file in media player 11

I recently had a breach in my identity and wonder if someone hacked into my
computer, or somehow attached a keylogging program, or something. While
looking for something in my windows media player, I saw a file I never saw
before, and the properties say it is from microsoft. In the media player
menu, at the very bottom, it says "Owner on your-bd61b647f7". When I click on
it, I get a message "before you can play items in this library,you must first
be allowed to access the library". I can access all the media player
functions accept this strange folder that I do not understand. I found a link
in microsoft.com that said to remove files type in search
"%localappdata%\microsoft\media player". I did all this. It removed all my
files except the mysterious one. Does anyone have any idea what this is?