unable to login to database reason: server closed the....

[byosti]

connection unexpectedly. This probably means the server terminated abnormally before or while processing the request.

I'm getting this away message on the left hand side(where the players list is) as soon as i start PT3.

[WhiteRider]

PAHud questions only - NOT PT3 HUD.

You need to restart postgres.
Start -> Programs -> PostgreSQL -> Start Service.
If this (or a reboot) doesn't work, see the Database / Postgres FAQ, especially the bit about postmaster.pid.