I assume you have copied the private folder to the SD card inside the new folder and the Kn7000 can no longer read the files because of this incorrect folder structure.

The private folder must appear in the root of the SD card.

Firstly confirm that the private folder on your laptop contains all your files by looking inside the folder structures until you see all the technics files, or by right clicking it, then left clicking properties, and seeing the number of files and size approximate to what you expect to see.

If not, just copy the private folder from the card to the laptop again, just to make absolutely sure.

Once you are sure the files are definitely on your laptop then just delete the new folder on the SD card, and then copy the private folder to the root of the SD card, that is directly to the E drive in your description.

It might be safer to use the backup and restore in Song Manager in future since it has additional advantages.