CTRL/ALT/SHIFT not repeating when held down

I got a new computer, and my control, alt, and shift keys don't repeat when I hold them down. For example, in MapleStory on my old computer I could keep jumping if I held the alt key down, but on this computer I need to keep pressing it for my character to keep jumping. Sticky keys are off and every other key repeats fine. Any way to make them repeat?