For reasons I won't go into, I want to keep my installation of MetroGuide ver.4.00 and install City Navigator 2009 onto the same PC. I'm pretty sure that if I try to install CN2009 it will overwrite my earlier version. I know I can rename the relevant directories but I can't work out how to avoid a major clash in the registry. I'm more than happy to fiddle with the registry if that is what it takes but a Google search hasn't provided any hints. Brian.