Don,t bother, I bought nav 2004 pro had so many problems with it I uninstalled it and got a money refund and then went back to my oem 2002 version.
Problems were, IE crashing so many times I lost count,scanning outgoing email window with progress bar LOST, my epson perfection scanner was taking forever to fire up and the biggest headache was that it made my pc hang on shutdown-taking up to a minute.
All in all a load of rubbish!!!!!!!!!!
I spent days trying to configure it and to try and sought out the problems, but to no avail.
Dell Dimension 4300 o/S winxp home 1GB ram.
Anyway hope you have better luck with yours.