Lines on the screen as if the browser is temporarily freezing

Hi, I've just got a new PC so have a fresh install, but firefox seems to display funny lines as I'm scrolling down the page. These lines can disappear or change if you scroll further, or if the browser loses focus. Any ideas? It's really frustrating - I use FF for development so it's a real pain. [http://imageshack.us/photo/my-images/191/firefoxscreen.jpg/ I've uploaded a screenshot here] . Thanks

Try to disable hardware acceleration.
*Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
If disabling hardware acceleration works then check if there is an update available for your graphics display driver.
*https://support.mozilla.org/kb/how-do-i-upgrade-my-graphics-drivers

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The Windows XP links tool bar at the bottom of the screen now hides the last line or lines of the browser screen. Why? (V3.6.16)

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How do i get my navbar to stay on one line when the browser window is minimized?

I am new to coding and have just created my first website in html and css. I know that the coding is pretty dire and that I have a lot to learn and hope that someone can guide me in how to solve this problem. When the browser window is minimized, the navbar breaks down into 2 or 3 lines but I want the navbar to fit to the window whatever the size of the client machine.
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Here is my code:
HTML
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>The Engineer's Corset</title>
<link href="styles/style.css" rel="stylesheet" type="text/css" media="screen">
<style type="text/css">
body {
    background-color: #000;
</style>
</head>
<body>
<div id="container">
<div id="navbar">
    <ul id="nav">
    <li><span class="current-menu-item">Home</span></li>
    <li><a href="about.html">About Us</a></li>
    <li><a href="workshops.html">Workshops</a></li>
    <li><a href="news.html">News</a></li>
    <li><a href="gallery.html">Gallery</a></li>
    <li><a href="contact.html">Contact Us</a></li>
    </ul>
</div>
<div id="header">
<img src="images/final/headerbeauty3.png" width="1100" height="341" alt="The Engineer's Corset">
</div>
<div id="links">
<ul id="link">
<li><a href="https://www.facebook.com/Bristolengineer" target="_blank"><img src="images/final/fb3.png" width="200" height="45" alt="Follow Us on Facebook"></li>
<li><a href="https://twitter.com/Engineerscorset" target="_blank"><img src="images/final/twitter2.jpg" width="200" height="45" alt="Follow us on Twitter"></a></li>
</ul>
</div>
<div class="chantry">
<img src="images/final/CD Logo fin.png" width="240" height="200" alt="Chantry Dance Company">
</div>
<div class="about">
<p> The Engineer's Corset is a new play written by Janet Goddard for performance by the community of Bristol in 2015. <br> ~ <br>
The play is based on the extraordinary real-life events of 1843 surrounding Isambard Kingdom Brunel's near-death experience after swallowing a coin. We travel through time to explore the adventure and horror of Victorian industrialisation. <br> ~ <br> Using a community theatre group The Engineer’s Corset tells a familiar tale of Brunel’s near death experience when he swallows a gold half sovereign. His wife Mary fights to maintain her composure but is ripped apart by the waiting game. Her servants and his workforce, using dance and sound, broaden her horizons. Just like Mary the audience too will see life in the 1840s through a different lens.</p>
</div>
<div class="workshops">
<img src="images/final/bridgebridge.jpg" width="1100" height="713" alt="clifton suspension bridge">
<span><a href="workshops.html">We will be running a series of workshops prior to production and hope you will join us. For further information, click here.</a></span>
</div>
<div id="sponsorspace"></div>
<div id="footer"> <p> © Heartprints Web Design 2014 </p> </div>
</div>
</body>
</html>
CSS
@charset "utf-8";
/* CSS Document */
body {
    font-family:Arial, Helvetica, sans-serif;
    font-size:125%;
@media screen {
    #navbar:
#navbar li {
    font: 25px Arial;
    display: inline;
    list-style-type: none;
    background: #09F;
    color: #000;
    border-radius: 20px;
    padding: 15px 25px;
.current-menu-item {
    color: #0FF;
#navbar a {
    padding: 15px 25px;
    background-color: #6cf;
    color: #000;
    text-decoration: none;
    border-radius: 20px;
#navbar a:hover {
    background-color:#0FF;
    color: #000;
    padding: 15px 25px;
#header {
    width: 1100px;
    height: 340px;
    margin-left: 50px;
    margin-top: 0px;
    margin-bottom: 0px;
    border-style: ridge;
    border-width: 5px;
    border-color:#09F;
#links li {
    display: inline;
    width: 700px;
    margin-left: 300px;
.chantry {
    margin-left: 40px;
.about {
    position: relative;
    width: 860px;
    text-align:center;
    background-color: #CCC;
    color: #000;
    border-style: ridge;
    border-width: 3px;
    border-color:#09F;
    border-radius: 15px;
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    margin-top: -200px;
    margin-right: 90px;
.workshops{
    position:relative;
    width: 1100px;
    height: 713px;
    font-size:24px;
    margin-left: 50px;
    border-style: ridge;
    border-width: 5px;
    border-color:#09F;
    margin-top: 130px;
.workshops span {
    position: absolute;
    background: #6CF;
    color: #000;
    left: 30px;
    top: 30px;
    right: 800px;
    padding: 15px;
    font: 1em georgia, serif;
    font-style:italic;
    text-align:center;
    border: 5px solid #09F;
    border-radius: 20px;
    margin-top: 35px;
.workshops span a {
    color: #000;
#link li {
    border-style: solid;
    border-color: #6CF;
    padding: 30px 10px 5px 10px;
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    margin-top: 50px;
    margin-bottom: 50px;
.CDC {
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    margin-right: 50px;
    margin-left: 45px;
.workshopinfo {
    height: 250px;
    text-align:center;
    margin-top: 50px;
.photos {
    Height: 500px;
    text-align:center;
    margin-top: 50px;
#footer {
    text-align:center;
    margin-top: 700px;
    color:#0CF;
.brunel {
    margin-top: 50px;
    margin-left: 400px;
#workshops2{
    width: 1000px;
    border-style: outset;
    border-width: 5px;
    padding: 15px;
    border-color:#09F;
    background-color: #6CF;
    margin-left: 100px;
    text-align:center;
#workshops2 a {
    color: #000;
#sponsorspace {
    height: 300px;
    background-color: #6CF;
    border-style: outset;
    border-color: #09f;
    margin-top: 15px;

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Lines on the screen as if the browser is temporarily freezing

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