Well... I'm no tech expert but fist I would check your "manage audio devices" in you control panel to make sure your mic and speakers are assigned and working properly. If that doesn't work, give restarting your computer and try again (you'd be surprised how many problems get fixed by doing this ). If that all fails, it's either something I don't know about or just a temporary hic up with the website.
I would also contact Art Andrews. He might be able to tell you what's up! Hope this helps!