Problems Creating a Bootable CD for Backup Exec IDR Option

I am new to Backup Exec software and would like to use the IDR option
but cannot create a bootable CD. Using the IDR wizard creates a
compressed ISO file which I then uncompress and burn to a bootable CD
with Nero. When I boot the CD it loads MSDOS and not the IDR system as I
expected. Help from symantec is totally useless! They refer me to docs
which don't help at all. They must use India for their support.

I am running Windows XP Pro (SP2) with 1GB RAM and 1.5 GHz AMD CPU. I
assume that I should get a Windows Setup screen if I could boot the CD
properly. Can anyone help me with this problem? I'm sure it's something
very simple that I am not doing.