Hi,
Not sure if this will be of any help, but what type of burner are you using? The reason I ask, I was using a DVD CD burner and no matter what they tried, couldn't get Express Burn to work with it. I had to buy an external burner and then everything worked fine.
BTW, my DVD CD burner was a Pioneer.
Express Burn is a cool program, I hope you can get it working!
Lewner