help with simple action

Hi guys,
in the past I used to have a very simple action in PS that I made myself: resize the image and 'save' on desktop and close the file.
yesterday I had to reinstall PS that caused my action not to work anymore, and since it's quite a simple one I made it again (I do tend to use it a lot).
now... what happens is that every single picture that I run with this action is saved on the desktop as the file that I used to make the action... the picture is different, but the name is the same....
in the past I had every file that I ran with the action on my desktop, but now it's just one file, showing the same image name over and over again... very annoying and I just don't remember what I have to do...
in the text of the action it shows the name of the file, so I know that it goes wrong at that point, but... what do I do to avoid that?

thnx so much for your help!
Anneke