Some schools and offices have firewalls or proxy servers which are between your computer and the Internet. If this is true in your case, you need to make sure that your player is set up to pass through the firewall.

To do so in the Windows Media Player:

1. Right-click the video.
2. Select "Properties."
3. Click the "Advanced" tab.
4. Highlight "Windows Media Source Filter."
5. Click the "Properties" button.
6. Click "Configure proxy settings" and enter the name (or IP address) of your proxy.

Note: Please make sure to check with a parent, teacher, or adult in charge of the computer before downloading any software or changing any settings on your computer.