Problem with DLL files under the Windows system when it comes to using libraries such as numpy or OpenCV it might give you a few problems. Often the problem is lack of standard VisualStudio libraries in which libraries were compiled. Then in this case all you need is Visual C++ redistributable 2015 in the right version or Universal C runtime. If this is not enough and the problem appear which library is missing and in what version it should be.

With help comes two simple tools. Dependencywalker – which check dependencies in Windows. It is vintage tool and it can’t solve properly all dependencies. Second tool is procmon, it tell us where Python is looking for libraries and why it cannot find it.