Personally I dislike the real player, but .rm files are around so it has it's place - luckily, Real Alternative has been added into K-lite so you don't need real player anymore. Just uninstall real player, and your previous version of k-lite (if you were using it) and then download K-lite Mega
Download Here and install it. Once you do that you can watch real player files (.rm) and .flv files with WMedia Player.
(I have found that WMedia player won't play all .flv files for whatever reason so I also have the FLVPlayer for the few .flv files that have problems with WMedia)
Download Here