I am trying to implement SSL certificates with postgres 9.3 locally in Windows 7. In Windows Component Services / Local Services, postrgres is configured to start automatically, with Log On as a local system account.
Postgres on Windows will not start if it's running on account which belongs to Administrators or PowerUsers groups.
LocalSystem belongs to Administrators.
On most cases you would like to use for example NetworkService account, however you need to setup proper permissions on cluster data directory (full access), postgres installation directory (read+execute mostly), and in some cases also for root drive of cluster data directory (read access).