I did all of the attached:
Now you will see an area called system variables.In the window you should be able to scroll to an entry named Path.Click the path line in the window - now click edit - another dialog will open in the VALUE area you will see a long line of variables add this at the very end INCLUDING the semicolon at the beginning.
;C:\Python26\bin;C:\Python26\lib;C:\Python26\tcl;C:\Python26\Libs
but fog filter stays grey.
Python shows a console and program directory shows correct
so now what?
(Select ok, then ok, then ok again
Now restart your machine.
The variable value should be recognizable by Windows and Gimp now.Restart Gimp and look for the menu entries, and test to make sure they work.I usually run the Filters/Render/Clouds/Fog filter.
If this does not fix the problem check to see if the files
YourProgramDirectory\GIMP-2.0\lib\gimp\2.0\interpreters\pygimp,interp AND
YourProgramDirectory\GIMP-2.0\lib\gimp\2.0\environ\pygimp.env are in those two directories!
DO NOT MOVE OR EDIT THESE TWO FILES! - unless you know what you are doing.)