I am trying to run the examples, but all Windows display a blank image.

If the image is completely blank (perhaps black or white), it is highly likely that the OpenGL drivers of your graphics card are not up to date. This problem typically occurs if you have installed a fresh copy of the Windows operating system and are using the default drivers provided with the Microsoft distribution. If this is the case, please verify the model of the graphic card (NVidia, ATI, or Intel), and download the latest drivers from the manufacturer's website.