That particular message from the Event Viewer usually means security software on your computer is preventing PostgreSQL from starting when your computer does. If you're using any security software (such as antivirus, firewall), please make sure to follow the instructions given in the
Security Software Configuration Guide to see if that resolves your problems. If it doesn't what you can do is this:
1. Temporarily uninstall all security programs (firewalls, anti-virus/malware, etc.). Disabling them or turning them off won't be enough.
Don't visit other web sites, download other files or emails until they're reinstalled.
2. Reboot your computer.
3. Start PokerTracker4 and see if it will run now - if it does that means PostgreSQL is now able to start up.