I get this error when trying to open PT3 trial. PT3 did not install PostgreSQL, so I installed it manually. I can see the PostgreSQL.exe in my processes tab - and I have removed the postgres password I am running XP
What was the problem with PT3 installing postgres? Did you download the 'Full' install version?
Did you install postgres with the 'postgres' user? Is it on port 5432?
Please enable logging, reproduce the problem and submit your PokerTracker.log file to the Support system , and link to this thread in the reference field of the ticket so that we can investigate.