I need to get back on the wagon and give repo making another shot.
I found the problem with mine, eprom burners mostly don't like 64 bit OSs, and the parallel port on my Mobo was not wired up all the way. I have an older laptop now that works.
Alternatively, you can have the guy at NES reproductions burn your game for you at $7 an eprom (note some NES games require 2 eproms, CHR and PGR)