Batch rename files

Hi all.
I'm looking for a program (preferably freeware) that'll mass rename files and will run on Vista x64.
I used to use renwiz on XP but it doesn't work on vista.
Any ideas?

http://www.rlvision.com/flashren/about.asp

Use Better File Renamer 5.1. Worx gr8 on vista :D if u need link for it then PM me:)

Thanks, I'll give those a try.

I second flash renamer. Very good program.