I think I've posted this in the TVT forum as well, but I'll go ahead and respond here, cos that's easier than tracking down previous posts ::
It's probably your proxy settings in IE, which is where TVSU gets its network access info. Do this:
1. Open IE 2. Click Tools -> Internet Options 3. Click Connections Tab 4. Click "LAN Settings" button 5. Check your proxy settings. Most likely you want to use "Automatically detect settings" and clear any other checkboxes. 6. Click OK 7. Click OK 8. TVSU should work now.