Quite frankly, I've read your post a few times and can't quite figure out what you are asking.

Here's what I can tell you:

If the disc that you made will not boot in either computer, and I think that's the case from what I read but am not sure, it is very likely bad.

You didn't download an osi, although there is a good chance that you downloaded an iso.

Everything that you should need to know is in the downloading faq, see answer #1.