Error copying File or Folder [HELP!]?

Access is Denied: Make sure disk is not full or write-protected and that the fine is not currently in use. I recently had to reboot my PC from scratch because of a bad disk drive. I moved my iTunes folder into my Passport Essentials portable Hard Drive and when I tried to moved it back to the My Music folder,... show more Access is Denied:

Make sure disk is not full or write-protected and that the fine is not currently in use.

I recently had to reboot my PC from scratch because of a bad disk drive. I moved my iTunes folder into my Passport Essentials portable Hard Drive and when I tried to moved it back to the My Music folder, I get the above messaged. I've tried lots of stuff. Can anyone help???
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