Installing Jquery on Windows 7

Installing Jquery on Windows 7

I have already worked a lot with jquery but I recently installed windows 7 and somehow I can't get it working:( Could someone tell me what I'm doing wrong or do I need to download a special version for Windows 7?

It only alerts: "Javascript file is opened!"

HTML CODE
header
  1. <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script>
  2. <script type="text/javascript" src="http://<?php echo $_SERVER['SERVER_NAME'] ?>/OefenSites/WDG/javascript/jquery.js"></script>
JAVASCRIPT CODE
jquery.js
  1. alert('Javascript file is opened!');
  2. $(function() {
  3.       alert('Jquery file is working');
  4. });