For Postgres, I keep getting this error multiple times even though I have already set the location of the bin folder to the path variable in Windows 8. Is there something else I
Enter this path in your System environment variable.
C:\Program Files\PostgreSQL\[YOUR PG VERSION]\bin
In this case i'm using version 10. If you check the postgres folder you are going to see your current versions.
In my own case i used the following on separate lines:
C:\Program Files\PostgreSQL\10\bin
C:\Program Files\PostgreSQL\10\lib