You don't need a third-party program to accomplish, although they do exist. Just browse to where the files are located, select/highlight them all, right-click the first one, and name it whatever you want. All of the following files will be renamed using that name followed by a number. For instance, if I rename the first one John, the sequence will continue on John (1), John (2), etc. You can also start the count at whatever you want. For instance, if I enter John (109), the sequence will continue John (110), John (111), etc. The only catch is that they must all be in the same folder. If they're not, you'd have to do each folder individually, starting the count where the last left off.
Hope this helps,
When importing my digital photos onto my machine, Win XP has an import tool that allows me to state the topic of the pictures, and then it automatically renames those pictures with that subject and a count. However, if I've chosen to not use that import tool, the pictures are then on my machine with their generic name that was given by my camera. I am looking to quickly rename multiple photos and was wondering where I can locate that import tool on my Win XP machine (I've already checked my program files), or if there is other software out there that will allow me to quickly rename these files.