I have a Logitech G110 keyboard, if it matters. The volume scroller on my keyboard controls both my system volume and the volume of whatever media player is running at the time. Is it possible to disable system volume control and control only my media player?
Depends on what media player you're using. Foobar, for instance, allows you to set global hotkeys. I have used this feature to set Function keys as volume controls, and this controls the media player's volume independently of the system volume on Windows. However, that feature might not support your specialized keyboard volume scroller.