PokerTracker

I have pocker tracker 4 for many years and now to run it and this comes out
unable to login to database postgres reason could not connect to server connection refused the server running on hos? and accepting tcp ip connections on port 5432

then it lets me enter poker tracker 4 only in the databases I get black and white and it won't let me create a new one

Locate and delete the postmaster.pid file if it is present (not "postmaster.opts" which may be there too). You can find that file in C:\Program Files\PostgreSQL\9.3\data\ although you may have a different PostgreSQL version (e.g. 8.4, 9.0) or have it installed in elsewhere. Once it's deleted, reboot and try starting PokerTracker 4 again. If that does not help then click your Windows Start button then type the following command:

services.msc 

and click on it when it appears. Do you see the PostgreSQL service in the list? Is it started, or can you start it? If the PostgreSQL service is listed but not starting then open the Event Viewer (in the same way - if you type 'event' you should see it). In the top left section, expand "Windows Logs" and click on "Application". Do you see any recent errors in the top center section for PostgreSQL? If you do let us know what they say.