This is what I would do.. (I'm no good at scripting mind)
Windows search *.iso on the folder.
Cut all files into 'ISOS' folder
Then in CMD, go into that ISOS folder and type..
dir /b > files.txt
open this file in notepad, and find/replace the .txt with 'nothing'
now copy all of the bare filenames into excel, paste into b1 downwards
then in a1 downwards, fill with.. mkdir
now copy A and B, paste into notepad, and copy the 'tab' space, and find/replace this with a 'space', save the file as maker.bat and run that in the dir you want the subfolders created.
You can further use excel/notepad to move this files into the respective subfolders
long way of doing it, but faster than manually, if there's a lot of them