ediff errors - comparing and merging

"Dhiraj Gaurh" <[email protected]>
Newsgroups gmane.emacs.xemacs.windows
Message-ID <001701c34619$782233e0$9ee310ac@Dhirajgaurh>
Hello,
 Whenever I want to merge two files,  I can select the first portion of code to be used from A or B by pressing the required A or B in the ediff panel but then when I press the space bar to go to the next difference, I get an error :-
c:Program FilesXEmacsXEmacs-21.4.11i586-pc-win32diff3.exe: diff error: 

What is this error due to. I am unable to merge files. Is there some problem in the diff routines.
Another thing is that if a want to compare two directories, it shows a browser which wants a file as input not a directory so I am unable to compare directories. I will be thankful if you can suggest anything to solve these problems.
The about box says I am using version 21.4. I am using Windows XP.
thanks
Dhiraj
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