How about the URL of one of those websites so that we stand a fighting chance of knowing what your problem is
I just bought a PC and i'm not so familiar with it. I've been a Mac user for a long time. whenever i go to a website that i can listen to music from the site it self, it says i'm missing a plug in, but it doesn't say which one. Please help.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic