But you changed out the keyboard? I was going to say that when you spilled a Coke in there, you didn't clean it out good enough. But, that must not be it. If there is something wrong with the keyboard, you could run this: http://www.keyboardtester.com/tester.html to check it. If there's a key that's stuck, you can disable that key with http://keytweak.software.informer.com/2.3/ Or, check: Settings> devices> mouse & touchpad (or mouse)> scroll inactive windows when I hover them> off (If it's only certain programs, and it thinks you wanting to scroll?) Maybe try enabling / disabling the Scroll Lock? If none of that works, bang on the keyboard in various places with a hammer. This won't fix anything, but it's therapeutic.