I also removed all other USB devices and for a moment this seemed to fix it. I already tried uninstalling the mouse driver, putting mouse into another USB-port (on-board vs. As long as that control is open, mouse scroll should adjust volume wherever the cursor is on the screen, but mouse-scroll events behave as described above. I can for example open the audio volume control by clicking on the speaker-icon in the system-tray (bottom right, next to the time and date). It doesn't matter if I have any windows open, even after system restart the behaviour is there right on the desktop. What blows my mind is, that the behaviour is totally dependant on where the mouse pointer is at the moment. Sometimes single scroll-down events are even registered as scroll-up. But on most of the screen, no mouse-scroll events register at all. In other (seemingly random) areas, about 50% of mouse-scroll events are handled, the rest ignored. For example, it works absolutely perfectly in the left 20% of the screen. Starting today, my mousewheel stopped working on some areas of the screen.
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