PostgreSQL ERROR: Could not load library postgis-2.1.dll

Question

I'm using pgAdmin III to connect to my PostgreSQL database (Postgres) and I'm trying to add an extension to the database which is Postgis.

Even though the "missing" file is in the folder the following message error shows:

"ERROR: Could not load library "C:/Program Files/PostGreSQL/9.4/lib/postgis-2.1.dll": unknown error 193."

Can anyone help me?

Solution

The windows version is not mentioned. With win 7 check wether postgis is installed. Remove it. From http://download.osgeo.org/postgis/windows/ get the right postgis installer and install new, then start in pgadmin with 'create extension postgis;'.