PokerTracker

Good evening, I have a problem with my poker tracker: I've formatted my pc and now I have reinstalled a new version of poker tracker. But when I open it, I read this message: "Error connecting to default database.
Please select one of the valid database below or create a new one".
And there are two database that I can't select!! Why? I don't have postgreSQL installed in my pc! And although I install it, the situation is the same!!
What can I do??
Sorry for my horrible english, but I'm italian!
Thanks a lot and good job!

If you re-formatted your computer any databases you had would have been removed.
Did you make a backup before you formatted?
Have you restored that backup?

Did PT3 install PostgreSQL for you when you first ran it?