Your problem is Real Player. It is the worst piece of software ever written. Try "Real Alternative". VLC Media Player, amd or GOM Player are excellent also. Media Player Lite will need the Codec pack. Get away from "Real".
Download Real Alternative 2.02 - FileHippo.com
I do a lot of work with videos and do not use "Real" or any of their products as they are conduits to much malware