Windows 10 System occupies port 80, what should I do?

Question

Windows

Welcome all!
Updated to Windows 10. There was a problem - OpenServer does not start, reason: port 80 is busy.
In general, after dancing with tambourines, I found out an interesting thing: this port is occupied by System, and NT Kernel & System (~ 600Mb) is indicated in the task manager in the description. Which, as I understand it, is the core of something ...

that's the question: how to free the port?
because this construction is not convenient - localhost:81 (for example)

Answer 1

first, look for questions in the toaster that have already been answered
On windows 10 pro 80, is the port closed tightly by the TCP 4 protocol?

Answer 2

Find IIS -> Internet Services -> Security -> uncheck Request Filtering