1. Refresh the page that failed to load. If the page reloads, you just had a momentary lapse in service that happens with most providers. Between each following step, try refreshing the page to see if the problem is resolved.
2. Check the page address you typed into the address bar to make sure it is spelled right. An error in the URL address could cause this error message.

3. Go to your connection settings and make sure the settings match those of your Internet service provider or local area network. Do this by clicking on Tools on the toolbar, then Internet Options. Under the Connections tab, click Settings.
4. Click the 'Detect Network Settings' link on the Internet Explorer page accompanying the error message to let Windows try and find an optimum connection.
5. Download DNS error fix software off the Internet if no other option works (see Resources). The software is free on some websites and should be able to identify the problem and correct it.