[Infamous Nik]

I am attempting to burn my first dc game to disc(crazy taxi2)....Firstly i downloaded the rar files and ended up with 6 in total. However when I tried to extract it, it only allows me to extract the file ending with rar(I'm assuming this is correct??). Upon extracting this rar file I was left with 1 cdi file. How do I now burn this to disc using nero in order for my dc to recognise it...once I extracted the rar file was there anything else I needed to do????? Any help would be appreciated!!!!!!!