RealVideo FAQ at WebcastingTV:

WebcastingTV tries to keep track of the Questions and Answers to frequent problems.  Most problems are a function of simply missing one of the steps of a installation or update.  Many times an Internet viewer simply does not realize that they missed something.  The first thing you should always do is retrace the steps that brought you to the "problem" you are trying to fix.

Another source of frequent trouble is that a viewer changes something else on their computer, say they install a new software or hardware, and it interferes with another aspect of their computer.  Please keep tract of the recent events that have occurred within your computer when trying to diagnose a current problem.  Usually the "fix" is simple, even though the symptoms are confusing.

RealPlayer 7 & 8 beta: 
   
Start RealPlayer 7 or 8 beta. 
    Click the View menu and choose Preferences. 
    Click the Proxy tab. 
    Click the "No HTTP Proxy" check box in the HTTP Options section. 
    Click OK. 
    Restart RealPlayer.