I've had my IMAC for 6 months or so. I can't seem to navigate it very well but am coming along. I have not been able to open any video emails from the get go, so I tried to figure it out on my own. I realized that the Quicktime Pro player did not come with my computer, so I bought it online. It took the registration code, but what to do from there? I tried opening another email and it still doesn't work. What do I need to do?