You have an invalid browser for the following reasons:

1. You must have Javascript enabled
2. You must have Cookies enabled
3. The following list contains the minimum versions of browsers that can be used to access this application:
   Internet Explorer 7.0.0 on Microsoft Windows systems
   Firefox 3.0.0 on all operating systems
   Safari 4.0.0 on all operating systems
   Chrome 0.0.0 on all operating systems
   Your browser is: Unknown browser 5.0.0 on Macintosh systems

If you have a valid version of Firefox but are still being refused, your user-agent may have been changed, particularly if you have installed the Megaupload Toolbar extension or the Creative ZENCast plugin and then updated Firefox. In order to rectify the issue, please follow these instructions:

1. Type about:config in the location (address) bar of Firefox and hit your Enter key.
2. In the filter box at top type the following text: useragent
3. Right-click any general.useragent preferences that are bold and have a status of "user set" and select Reset.
4. Click Help, About Mozilla Firefox, and ensure that the word Firefox appears in the user agent string, such as : "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1b4) Gecko/20090423 Firefox/3.1.0"