Are you on Vista? Is UAC turned Off? Do you have a firewall? Have you tried turning it off or setting exceptions to allow postgresql, poker clients, trackers, etc?
I don't know much about troubleshooting SQL, so I would personally export and backup all my hands and then uninstall SQL completely and reinstall it. Then rebuild my DBs by importing all the exported/archived HHs. I usually prefer the fastest/simplest solution, and then has worked well for me on my XP machine. I also reformat every 6 months just to speed up my PC.
You must *fully* remove PostgreSQL if you want to install it again.
- Uninstall from control panel.
- manually delete the Program Files\Postgresql folders
- run the command "net user postgres /delete"
- reboot.
- install again, as admin, with UAC off.