in my files, my podcast folder is actually in my iTunes music folder. But anyway...i run Windows XP in Classic and i really don't have experience with other operating systems, so i hope this helps!
Open the actual folder that contains the files - NOT iTunes, the actual folder on your hard drive. (So probably C:\Administrator\My Documents\My Music or something along those lines)
You can cut & paste the files like you would text - press and hold the ctrl key and "click" "click" "click" on each file. Using the ctrl key will allow you to select more than one file at a time (also works in iTunes; very helpful if you manually control your library and need to add multiple files).
Then right click ---> select "cut". The files should appear dimmed, because they've been "cut" from that location.
Go to your podcast folder, and in some white space right click, then select "paste". Your files should appear!!
Make sure that they've actually been cut from the Music folder - sometimes the computer will choose to just copy the files instead of just moving them.
You will need to tell iTunes that you moved the location of these files, which you can do by A) deleting all of the files on iTunes and then using "add folder" to add them from the right location or B) clicking on the little exclamation point that will appear next to the name of the podcast when you try to play it, and re-adding each individual one.
Hope this helps!!

Feel free to PM me if you still have questions! (or others...take advantage of the computer nerd while you can, hahah)