Koibito Yuugi Help

I need help on this one. When I download the first disc and then I got this message.

http://img3.imageshack.us/my.php?image=helpr.jpg

So can anyone tell me what this message is?
Please help me cause I wanna play this game so much.
Thanks in advance.

I'm can't read Japanese(only know a few symbols), so it might be easier if you gave us a description of when it happened, what the screen looked like prior to the pop-up window, etc. That would be really helpful. :3

Also, have you checked if your computer meets the requirements to play the game?
Does it show up right when you open installation, or just somewhere in the middle of installation? (If it's the latter, it might already be installed)
Does it show up as soon as you open the program?
Also, which link did you download it from?
(Sorry about the questions, I just need more info)
*wished she knew kanji*

Thanks for answering my help and I don't know about the requirement since I download it from here... This is my first time installing this game and this pop up right in the middle of downloading disc 1. So I doubt that this game is being install... hope that helps ya...

Hm...That's weird.
Do you have another computer that you could try to download it again?

Edit: Before that, do you have Quick-Time Player installed onto your computer?