I had not even noticed this mention of "Windows 7 N" in your system specs, or your first post which mentioned it as well!
But then I also had no idea that "related technologies" would include support for cameras.
And I certainly don't understand why Microsoft issues a version of Win7 without WMP and related technologies (presumably for a reduced price??) and then turns around an makes this "Media Feature Pack" available for download (presumably for free). Very strange.
Anyway, this is obviously a very significant and useful discovery.
Glad you finally got your problem solved. (but can't hurt to have a 56-in-1 card reader for $6, just as one more tool in your arsenal of problem solutions)