You might need Quicktime [free] installed on your computer to see some of the videos. If you can't see some of them, go to the following link and install the free player onto your computer (Windows or Mac).
Click the free download link (the pay version is Quicktime Pro, which you do not need)
If you are using Windows and it does not play, you can also try right clicking on the file and downloading it to your desktop. That should solve the problem of your browser not playing it. I don't care if you save them to your computer. Consider it my gift to you. 0:) [insert little bell chime]