Make sure you don't have a proxy server interfering:
1)Open Control Panel (Start Menu - Control Panel)
2)Click Internet Options
3)Click CONNECTIONS tab
4)Click Lan Settings button
5)Make sure the box under the Proxy Server section is UNSELECTED
6)(Optional) SELECT Automatically Detect Settings
Go to http://www.magicjack.com/techchat/ them click "Get live help in Seconds". On the bottom click "click here". Click "search" without enter anything. Click "start chat I'm Online". Fill in the form and done, you can chat to someone online. You dont need more than your magicjack phone number.