But a computer without educational games certainly won't help, and I can see how it can hinder.
Bull shit. There are dozens of ways computers can be helpful without the need for educational games. My first introduction to programming was writing small perl programs to aid in understanding math homework better and getting it done quicker. After I got into this, one of my favorite pass-times quickly became solving problems on projecteuler.net, which led to a better understanding of programming and mathematical concepts.
In my opinion, it isn't the computer that is causing the poor school performance, but the application of the computer to perform worthless activities such as posting to Facebook, browsing Youtube, etc, for hours on end. Anything (television, talking on the phone, banging your head against a wall, etc) will cause poor school performance if it replaces study time with mindless nonsense.