Firstly, if you're just starting out with PokerTracker you should go directly to PT4 - it is much more advanced and easy to use than PT3.
PT3 is still supported, but no new functionality or features will be added now.
PT4 Download PagePostgreSQL 9.2 is not yet supported as it is very new and has known problems. The same applies to 9.1, so the version we currently recommend if you want to do a manual installation is 9.0.
When uninstalling it is important to fully uninstall in order to be able to re-install - please follow the appropriate guide in our
Documentation.
If you still have problems after reinstalling 9.0 please
report your problem so that we can check your logs and see what is going on (or if you update to PT4, see this
Tutorial: Reporting a problem).