I am using Windows 7. Here are the three pages that I created using Build Your Own Web Site The Right Way Using HTML & CSS 2nd edition. For some weird reason, only the Home page seems to be working.
<head>
<title>About Bubble Under: who we are; what this site is for</title>
<meta http-equiv="Content-Type"content=“text/html; charset=utf-8”/>
</head>
<body>
<div id="header">
<div id="sitebranding">
<h1>BubbleUnder.com</h1>
</div>
</div id="tagline">
<p>Diving club for the south-west UK-let's make a splash!</p>
</div>
</div> <!--end of header div -->
<div id="navigation">
<ul>
<li><a href="index.html">Home </a></li>
<li><a href="about.html">About Us</a></li>
<li><a href="contact.html">Contact Us</a></li>
</ul>
</div> <!-- end of navigation div -->
<title>Contact Us at Bubble Under</title>
<meta http-equiv="Content-Type"content="text/html; charset=utf-8"/>
</head>
<body>
<div id="header">
<div id="sitebranding">
<h1>BubbleUnder.com</h1>
</div>
<div id="tagline">
<p>Diving club for the south-west UK-let's make a splash!</p>
</div>
</div> <!--end of header div -->
<div id="navigation">
<ul>
<li><a href="index.html">Home </a></li>
<li><a href="about.html">About Us</a></li>
<li><a href="contact.html">Contact Us</a></li>
</ul>
</div> <!-- end of navigation div -->