Have been using this great utility for a while now to rename images from CCD Soft and also family pics. Maybe useful to others here.
PeterM
"Bulk Rename Utility is a free file renaming software for Windows. Bulk Rename Utility allows you to easily rename files and entire folders based upon extremely flexible criteria.
Add date/time stamps, replace numbers, insert text, convert case, add auto-numbers, process folders and sub-folders"...
http://www.bulkrenameutility.co.uk/Main_Intro.php