Realplayer....... I somehow used to get emails from them about some stupid band called (I think) 'The Real Band' or something like that.
Used to get what seemed like an hourly update on them, where they are playing, what they are doing etc etc so I unsubscribed one day from the email service.
Got a reply from some guy asking why I wanted to unsubscribe.
"Well I don't live in America, I have heard them and I think they are s**t!..."
"Well, how about we keep your email on record in case you come over the water you might like to check them out or tell your friends....."
I will let you guess the two word reply I sent back to him.
Back to the original question. I have iTunes here for my ipod, love the playlist thing on it and I have had no problems with it at all. Doesn't really affect my laptop here either, if it does, I can't really tell to be honest.
I think I have WMP as the default, am happy with that too, no problem with it.
Also got Irfanview as that can play music on it.