Settings for real-player messed up

Hello One of my users cant start realplayer anymore. If a link is pressed in konq. or he just try to run it from promt - the CPU load goes to 100% until the process is killed. No realplay window. Other users on the same machine have no problems. I guess some settings for realplay is messed up - how do I restore these without loosing the entire desktop -- Regards Klaus Vink Slott