I have tried to load evox onto my machine. It did not copy properly and now when I boot I get error code 16. I have tried using the dvdr which I was given with the software on, but that will not boot. I have also tried burning evox onto a cdrw, which has worked before on my xbox, and that will not boot either.

Can somebody let me know the best cdrw media to use

there is no BEST media to use, as there are different versions of dvd drives in xboxs. search the board for the model dvd drive you have, and compatible media. this has been discussed tons of times.