Didn't find the answer there JacKDynne, but I did solve the problem. I installed a new serial number from the Nero Express screen.
Strange. Because you have a choice in the Start Menu to run classic or Express. The difference is that a "/w" is added to the command, but without adding the new serial number, only Express would start.
Nerorunner.exe is a small program that allows you to switch between express and standard. I would have attached it but "attach file" seems to be missing.