Dload n use this media player instead.
www.videolan.org/vlc
or if U still insist of using RealOne player..then U’ll need this link.
www.afterdawn.com/software/video_software/ codecs_and_filters/ffdshow.cfm 
hello......
i’m trying to ply my mpeg file in real player,but real player trying to update the software for playing the file but this message is coming out
==>
“In order for RealOne Player to play MPEG-2 files, you must first install a DirectShow-compatible MPEG-2 decoder on your computer. Most computer DVD playback software includes a DirectShow-compatible MPEG-2 decoder. If you have DVD playback software installed, please try re-installing this software before attempting to playback MPEG-2 content.
"
i already install few MPEG-2 decorder but is useless....
pls help to to slove my problem...