Cannot open Outlook 2003 at all

Recently purchased new computer (after a HD crash) that had a trial version
of Office 2007 installed. I uninstalled the trial version and re-installed
my trusty Office 2003 Professional. I then restored my latest backup of my
HD - which was only a week or two old.
Since then I have been total unable of use or even open Outlook 2003.
Getting a message that my "default e-mail cannot be opened" and "a datafile
to send & receive e-mail could not be found" and "go to the Mail icon in the
control panel to add a data file".
When I do this there is nothing to choose from and no way to manual enter a
name.

I've tried reparing my PST and copying it from the old location to what I
think is the appropriate new location, bu tstill no luck.

Any suggestions?