How about, COPY DISC, and for your Destination select Image Recorder?
I'm using Nero 7, and I guess I did install Nero Express 7. I select Image, Project Copy, then Copy Entire CD (or DVD), then pick the source and then destination. For destination, one of my choices is Image Recorder, which makes it a file. Just make sure you pick ISO...
If that doesn't work, then you're going to need to look at alternative softwares.