How to free 80 port on Win 8.1?

Question

open server

It costs OpenServer, I go to the page, and there:
Forbidden
You don't have permission to access / on this server.
Apache/2.2.24 Server at 34bit.ru Port 80
I look at the task manager, and there:

So?

Answer 1

Why is there a screenshot from the dispatcher?
If the port was occupied by someone, the server would not start.
The error says that the server's security rules do not allow viewing the contents of "/". Perhaps it was necessary to specify the domain name of OpenServer'a?
For example: localhost/domain