ok....d2 means nothing really it is not a chip..but i if i take d2 it could be...
d2c is the wiis chipset
d2pro is a modchip for the wii.....
if its a pal wii i suggest you only use pal backups. (look at the file it usualy says ntsc or pal)
as for games....when you have unrared them you will be left with a iso file.....
burn the iso with any burning software you like at 2x speed.
if it doesnt work after this, try a different brand of dvdr. not cheapo media.
if it still doesnt work tell your friend to go back to where he had this done and ask them to check it for him...