cannot install

[actionjack]

I cannot install PT3 no matter what i do due apparently to problems relating to postgres which even after all related files have been deleted to start from scratch seems to require (keepos asking for) a password even when its not set up.

Can you please help with this

[WhiteRider]

Please see this post for how to do a complete re-install.
Note that if you're using XP you can just use the PT3 with postgres installer when it comes to re-installing, but on Vista you are safer to follow the exactly instructions. Either way, follow the complete uninstall process carefully.

Total uninstall/reinstall of pt3

[actionjack]

Is there an easier way to do it?

I have never used PT before so i have no worry about losing information as i have none,

[WhiteRider]

No, you will need to completely uninstall postgres if you have a half-done installation. The steps are pretty straightforward if you read it carefully.
Once you have uninstalled postgres, just run the 'PT3 with postgres' installer and it should set everything up for you.