Quicktime is not installed correctly.
There is a problem with your web browser's plugin setup.
You can go here for Quicktime's troubleshooting page, or just click here to install or reinstall Quicktime, which takes only a few minutes, and solves this problem. (Follow the directions to download and install the "Free Player".)
After you return, please re-test your Quicktime installation with our test page. You may need to push your web browser's "refresh" or "reload" button while on the test page to get the current status.