Automator help

Hello my fellow OS Xians.

I need some help with creating an Automator workflow.

This is my scenario:

I've been using a film scanner (Nikon Coolscan V - oh so sexy), to scan in my collection of photographs - using TIFF format. The default filename that the software chooses is 'untitled'. So to save time, I've been leaving that as default and simply adding a number to the end of it, eg. 'untitled 1'.

What I want to do, now that I have hundreds of these files, is create an Automator workflow which will rename these files from 'untitled' to something else, but I want it to leave the number in tact.

Is this possible? Can someone give me an idea on how to do this?

I've used Automator in the past to rename bulk files using the 'sequential' option, but the problem here is that there are other files and folders inside the same folders that the images reside in.