I would proceed by disabling some of services listed on your screenshot to identify the culprit. Problem is, there are services which are essential for normal operation, and disabling them might cause you a lot of trouble (e.g. if you disable Group Policy Client or User Profile Service you may not be able to login anymore).
If you have an idea on which service have been installed / enabled recently, you should start by disabling it. Otherwise, I'd try to disable "Server" and "Internet connection sharing" to see if that helps.
It may so happen that you actually need those services so you cant't just keep them disabled. However, if you can prove that they are the source of the problem, your question will become much more specific and answerable.