Well, I have a copy of Nero that works well in Vista, so it's only the XP machine running version 7 still that's refusing to work in anything other than Express. However since that's my spare PC and Express does mainly what I want it isn't too much of a problem.

However, I might give your Ashampoo Burning Studio a try on the computer that won't run the Nero Burning ROM part of the package - thanks for the tip