EU maps

I have just received the TomTom European city maps and gone through the wizard to install a city map of Turin. Everything appears to be OK but when I try to switch maps in Navigator I get a prompt to say 'no other maps installed'. Am I stupid or is there something else I need to do.

[Charlie]

I think Citymaps is a seperate application from Navigator and you should find the launcher in the PROGRAMS folder. Can anyone correct me if I'm wrong?