I'd skip the two programs you linked to. They seem more trouble than they're worth and they still won't bring down the best images, which live only at iTunes.

If Tag&Rename can pick up the folder.jpg then that might be a workable if you're already using it. The second link I posted should be fairly straight-forward though if not.

Of course one could also just buy a Mac. It has a complete and total lack of any half-decent third-party tagger programs, but AppleScripting iTunes provides a lot of great benefits for managing stuff like this. Even if it's not blindingly quick.