We usually recommend you install it and use the trial before purchasing, but rest assured we will help you get it running.
Did you install Postgresql already?
http://www.holdemmanager.net/pginstaller
Which Operating System, Firewall, and Anti-Virus are you using?
For W7 and Vista you must set \holdem manager\dbcontrolpanel.exe, holdemmanager.exe and hmhud.exe are started as administrator. Run the windows explorer and navigate to your Holdemmanager installation directory. Right click the executables and select "Run as admin" from the compatibility tab. If you have Vista and the checkboxes are greyed out and you can't select it, please turn UAC on, reboot, and then set the files to run as administrator.
Add exceptions to the windows firewall, even if it is off. If you have a 3rd party firewall, do the equivalent or uninstall it temporarily -
http://www.holdemmanager.net/faq/afm...aspx?faqid=171
If none of that helps answer the questions and I will help you get this resolved.