For people that have problem with "Please insert cd/dvd" try this solution. Remove your Internet cable and start the game. And if it works, then you can put back Internet cable again. Hope it works ^_^
Nevermind it didn't work, at least not for me. And for you people that ask for serial why don't you try and open NFO with notepad? I though everyone knew that by now.
EDIT: I manage to make it work. Iam using Windows 7 with Virtual CloneDrive and I just install the game, after that I use sd4sucks to hide Virtual Drive, and remove my Internet cable. And there it works.
I don't know if you need to remove cable or not. Maybe only sd4sucks will do