unable to burn Boot Media

Hi,
I just bought 3 licenses and installed them on 2 computers. A 64 bit Win 7 and a 32 Bit Win 7 Ultimate laptop. I successfully burned a Boot Media on the 64 bit but I am unable to burn one on the 32 bit?? It give me these warnings/errors:

insert new media/ system is busy / insert blank media etc.
Ca i use the same boot media on both computers? But I would also like to figure out why it does not burn on the laptop. I burn some other items to make sure it was not the burner. I took out the cd's I tried to burn but they only got approx. half the Boot media burned and then they get rejected??
Any ideas??

Razz.