I would like you to perform a COMPLETE uninstallation of PokerTracker, but DO NOT UNINSTALL POSTGRESQL.
The files you need to backup in PT3 are (If you have made any customizations to PokerTracker):
C:\\Program Files\\PokerTracker 3\\Data\\layouts.pt3
C:\\Program Files\\PokerTracker 3\\Data\\StatDefinitionsCustomized.pt3
C:\\Program Files\\PokerTracker 3\\Data\\ReportsCustomized.pt3
C:\\Program Files\\PokerTracker 3\\Data\\Config\\Buddies.cfg
C:\\Program Files\\PokerTracker 3\\Data\\Config\\PokerTracker.cfg
PT3 moves processed hand history files to the folder defined in 'move processed files to' on the auto import tab and we recommend that you keep a copy of these files too - they will compress pretty well and won't take up too much space.
After you remove PokerTracker from the 'Add/Remove Programs', also delete the C:\\Program Files\\PokerTracker 3 directory.
Now, please reinstall
PokerTracker 3 - Build 5.2 with your Firewall/Anti-Virus/Anti-Spyware software disabled.
When you install PokerTracker and run it for the first time, you should be prompted to create a new database. This is where you will attach your previous database to your new PokerTracker install. Check the 'This database already exists checkbox, and then click the blue link 'Browse Databases'. After selecting your database, everything should be completed.
Please let us know if there is anything else we can assist you with!
Regards,
Matt