In terms of playing Real Audio files I suggest you get a copy of "Real
Alternative" which is a freeware, no frills audio player, and frees you of
the burden that Real Audio inundates you with.
I agree with all that's been said about Realplayer. One of the biggest
internet scandals in the UK is that you can't listen online to any of the
BBC's output unless you have Realplayer installed.