Windows/Delete Unowned Folder

Run from a user in Administrators group, and from a command line window elevated to Administrator permission

# Take ownership as self (CMD or Powershell)
takeown /f "C:\Path\To\Folder" /r /d y
 # OR
# Take owenership as Administrator group (CMD or Powershell)
takeown /A /f "C:\Path\To\Folder" /r /d y

# Give full permission to Administrator group
icacls "C:\Path\To\Folder" /grant Administrators:F /t

# CMD: remove the directory
rmdir /s /q "C:\Path\To\Folder"
  # OR
# Powershell: remove the directory
Remove-Item -Path "C:\Path\To\Folder" -Recurse -Force
 # alias rmdir
rmdir -Path "C:\Path\To\Folder" -Recurse -Force

Note: only reason "rmdir" won't work correctly in powershell, is Powershell aliases to Remove-Item