I'm using emacs GNU Emacs 23.3.1. I don't have admin privileges on my PC hence I just downloaded .zip and use emacs with no problem.
The issue happened when I wanted to compare 2 files : either using Tools->Compare on M-x diff.
In both cases when I provided 2 files for comparison it failed with the error:
'diff' is not recognized as an internal or external command,
operable program or batch file.
Assuming I can't change the path and etc because I don't have privileges how could I fix it?
Well ... I gave up trying to use Emacs for diff :) My goal was to be able to diff text and other files ... not necessary using Emacs. I found out that WinMerge will do the job for me. Ticket could be closed.