[wienie!]

I've read in this forum as well as other forums throughout the web with people having problems installing Marine Mania for Zoo Tycoon. When they try to install the expansion, they receive a "Media Authentication Failed" message. I had the same problem for a bit until I figured out what I did wrong when I burned image from the HD to a cd. Before I burned, I added a small text file to the image using WinISO. That was pretty much the problem. It has to be burned unmodified. After I deleted the .txt file, it installed without any problems. Hope this helps anyone with the same problem.