It says it's being installed but I think you're right, it isn't actually installed, because I've had this trouble before. I'm on Firefox, I'll try Explorer and see if that does anything. ( It usually doesn't). I'm on Windows Vista Home Premium, which is usually the source of all evil.
I can see the videos, I clicked on the one on "Rider's Position."
Hmmm...do you know if the Adobe is actually being installed? Are you using Explorer? Firefox? Safari? If you are on Explorer, can you try Firefox or vise versa? Are you using windows 06? 07? I'm not having trouble on my end and actually, no one has told me that they need adobe to watch the videos, so I am thinking of some other ideas. Can you see the videos in front of you? Which did you click on? Can you click on another? I'll wait for your answers and I'm sure we'll figure this out! :)