If you are reading this, you are probably using a browser other than Microsoft Internet Explorer. Sorry, but because it’s essentially an Excel spreadsheet embedded in a Web page there isn’t really much choice.
If you are using IE, either you don’t have the Microsoft Office XP Web components installed or, more likely, the security settings in Internet Explorer wisely prevent you from running unapproved Active X controls on Web pages. But you can trust this one, honest! Click the bar at the top of the Internet Explorer window to allow the components to run.
At your own risk, of course.
See the Microsoft Office Web site for more information.