Don't worry about it. A lot of people here seem to be on their high and mighty horse in regards to even the smallest hint of anything that could be defined as piracy. If they belonged to your grandpa and this guy put his name on it, theoretically you can change it back.
Oh, and don't worry about the mac-retardedness. It will come quickly to you, spend a little bit with it and you will quickly grow to like it. We were all newbies at one point or another, a fact that some of us on here are quick to forget...
thank you very much for this. how do I change the name? as I previously stated I am sooooo mac retarded.
also how do I make a .mac account?