Such a mixture of mis-used terms.
Kontakt “instruments” are not “plugins”.
Delete too many of those “Kontakt” folders and you’ll have a screwed system.
What shows up in the Plugin Manager are *.VST3 or VST3 *.dll files.
My apologies, I had Explorer on the left and my Plugin Manager on the right. Here’s my full plugin manager window:
You can see that there are three Kontakt folders there. In actual fact though, there’s only one “Kontakt 8” folder in my local folders. If I rescan, these folders remain.
I’m trying to solve an issue whereby after moving to Kontakt 8, I don’t see instruments when I load an Komplete Kontrol instrument track in Cubase despite them being listed in Komplete Kontrol standalone. I’ve got a thread open on the NI forums to help solve that, but I added to this thread here because I noticed I had folders showing up which weren’t actually on my system and there seemed no easy way to remove them (hence “difficult”).
There are no Kontakt “folders” in your screencap.
There are three different versions of Kontakt instrument installed and so listed in the plugin manager.
Do you want to uninstall them? Did you already try windows add/remove programmes?
I hope you manage to get over that soon 
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That’s helpful thanks… and good question. Do Cubase projects automatically upgrade Kontakt instruments when you upgrade Kontakt?
There is an auto migration function in Kontakt and Cubase supports it. If you uninstall K7 then Cubase should open K8 with the same instruments loaded.
Apparently Kontakt without number is K6 and that should also auto migrate.
See auto migration in this FAQ and the link under that section. Also instructions to uninstall the old versions
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Super helpful thank you. Each Kontakt version is sizeable so good to know I can remove them and maintain support. Keep finding reasons to be grateful I switched to Cubase. This is definitely one of them.