Process Monitor fails to load

I am trying to load Process Monitor (Procmon.exe) from Sysinternals, and I get the following error on startup.

Unable to load Process Monitor device driver

In the Event Viewer, I get the following.

Driver PROCMON11.SYS has been blocked from loading.

What is blocking it from loading?

Background information: I have no anti-virus or malware checker software installed, other than Windows Defender (which I think is part of Windows 7).

It seems that most people on the web who had this problem, solved it by installing a newer version of procmon, or an older version if their's was the latest.

For me, the solution in this article solved my problem.

In one word, we need to install KB3033929.