I cannot listen to radio streamed sites on the internet. Sometimes I get a message of "mysqladmin flush-hosts" and other times just no sound. Any advice?

The flush host thing looks like it's more likely a problem with the station you are trying to access, not your PC.

As for the no sound problem, can you give us some more information:

What program are you using to listen to the streamign stations?
Have you tried any other programs and got the same problem?
What's your version of Windows?
Have you tried many different stations?