From Vlastimil Burian:
The Infected Screen Saver provides you with a Matrix-like animation, an uncommon screensaver. Its simplicity can be described as somewhat orthodox. Your computer screen will get flooded with green characters and its Matrix-like graphics will generate the infected effect. Though, it is the idea of a Matrix screen, the resemblance is minimal. Furthermore, the screensaver's settings will allow you to adjust the speed as well as the color. (Despite its name, it does not contain any surprise in a form of a virus, of course).