3D applications (Maya, Mudbox) freeze when pressing modifier keys. (Shift, Ctrl,...

...Alt)? When I am using Maya or Mudbox, whenever i press either shift, alt, or control, the application freezes. If I release the button it will turn back to normal, but if i don't it lag my mouse whenever I move it. The longer I hold the button the longer it takes for it to unfreeze. I recently installed a GTX 760 without any problems, it is able to run everything else perfectly. I also recently purchased a Wacom tablet. The tablet is able to perform the actions with ease, just my keyboard has this problem. Restarting the computer does nothing.