Originally Posted by
Patvs
This is usually a firewall or windows update issue.
First try to reboot.
If no help, try this:
Start > Programs > PostgreSQL > 9.x > Stop Service
Start > Programs > PostgreSQL > 9.x > Start Service
If that doesnt help delete the \postgresql\9.x\data\postmaster.pid file, if you see it. And reboot.
If that doesn't help you will have to reinstall PostgreSQL completely.
(if 9.0 won't install anymore, try installing a different version to a different port, for example 9.2 to port 5433)