Hi I've had a a PostgreSQL 9.3 server running on Windows 7 for several months.
While trying to diagnose a remote computer's connection problem (through ArcGIS, grrr), i was clicking through the postgres (data) directory and opened a couple of files using Notepad but promptly closed them without making any changes. e.g. "C:\postgres\pg_clog\0000" and "C:\postgres\pg_stat\global.stat".
I added a line to the "pg_hba.conf" file and tried to restart the server, but now it will not run!
The messages in the log file are:
2014-10-09 12:59:40 PDT LOG: invalid connection type ""
2014-10-09 12:59:40 PDT CONTEXT: line 1 of configuration file "C:/postgres/pg_hba.conf"
2014-10-09 12:59:40 PDT FATAL: could not load pg_hba.conf