I'm using Photo Gallery with Windows 7 and looking for an easy way to clean up "People Tags" = "Who Is This?"

Let me explain, under "Quick Find" I selected "All Tagged But Not Detected" at the bottom of the screen.

I have several photos out of my 29,000+ that are tagged as "Who Is This" that I want to remove.  These photos are "not" showing up under "Batch People Tagging", where I thought I could easily delete these tags across multiple photos easily vs. doing it photo-by-photo and people-tag-by-people-tag, which is VERY TIME CONSUMING :-(

Any assistance in simplifying this process would be greatly appreciated.  Thank you.