Newbie question re ediff

[mkeller <mckellercran@gmail.com>]

Hi all,

This comes from a emacs novice. I've searched the old posts and found
several querries related to mine, but all the answers are over my head...
thus, please answer like you're talking to a "emacs challenged" person when
replying :).

I use emacs version 21-3 for programming in R (ESS). I'm running on Windows
XP. I would really like to use the "ediff" or "diff" functions but cannot
figure out how to do this. If I simply go to Tools -> Compare I get this:

"No such file or directory, diff"

After reading previous querries & responses on this forum, I installed
diffutils-2.8.7-1.exe and placed those utilities in the folder: C:\Program
Files\GnuWin32.

Now someone on a previous response said you need to change your _emacs file
"appropriately," but I have no idea how to do that. Do I need to change the
_emacs file so that emacs knows where to find the diff program? If so, how
do I do that? If not, what do I need to do to use diff within emacs?

Appologies for the level of this question, and thanks in advance,

Matt
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