Hello. Thanks for the welcome.
I just downloaded File and MP3 Renamer 2006, which appears to be the latest. It doesn't seem to support Vista. Also, I'm not sure if it's exactly what I am looking for.
I need something that automatically adds a prefix or suffix as I save it, if there is already a file with the same name. Maybe I read a bad description, but it looks like File and MP3 Renamer only renames files that are already on your computer. I guess it doesn't matter anyway, cause it didn't work.