Burning Audiobooks?

I am new to the group, so bear with me till I get to know everyone. I have a problem that I hope someone can help me with. I am trying to burn an audiobook onto a cd. I have recorded the book onto my hard drive in files small enough to fit onto a cd. When I use Nero to try and burn them, the clock shows that it is burning, but the % of burn never moves. After 5 minutes, it still shows 0% burned. Any suggestions?

is dma enabled?

What is the file format? I do know some of the audiobooks available for download limit the burning of their product.