We will need to do further research to determine the cause of this error. To help us investigate, please provide the following information:
Is this error happening only when playing a media file, if so what format (extension)? If not, is this happening when starting RealPlayer?
Please check if the RealPlayer system tray process is working correctly by following these steps:
a. Click on the hidden icons arrow in the lower right of your computer screen, near the clock
b. Right-click on the RealPlayer icon.
c. Click "Go to RealTimes Web" -- the realtimes.real.com website should open in a new window if everything is working correctly.
If this does not work, please reply with the outcome and let us know.