Providing that your DVD ROM drive will recognize a DVD- (or +) R, then, yep. Just make sure that Express is set up to the DVD options -- instead of the CD options (I've done that one, myself, and then couldn't figure out why Nero was complaining about file sizes; I'm blonde, male, and Polish... strike one, two, AND three! What can I say?). In the DVD options menu, just select "Copy Entire Disk," and you're done.
If, on the other hand, your DVD ROM drive doesn't recognize your copy (as mine won't... dammit), then just create a blank file, place your copy in your recorder, open DVD Decrypter and go that route. You won't affect the copy's quality either way, since you haven't re-encoded anything.