SFTPDROP error - nothign works

I have done every suggestion on this forum I coudl find and SmartFTP still creates an empty folder when I drag and drop files.

I am on an administrator account
I got the latest official download
I am on windows XP
I downloaded SmartHook.dll and tried to register it in command prompt but got an error saying it wasn't a valid application
I have restarted since installing

How do I fix this?
Thanks

Have you uninstalled SmartFTP before installing the new version? If not, do so and delete all remaining files in the SmartFTP folder (especially SmartHook.dll; if it cannot be deleted unregister it manually and restart all instances of Windows Explorer to try again). You may want to backup your SmartFTP settings using the Backup Manager before doing so. Then install SmartFTP again.l

It was from a fresh install, and i installed and reinstalled and the same problem

I had the same problem. A reboot fixed it.