Keyboard error. hi, can i ask a problem about my computer because my problem is that

Question

hi, can i ask a problem about my computer because my problem is that when i use to press a keyboard my computer/desktop freezes.When that case i restart my computer quickly after I restart its back again.What i used to type this letter is the on board screen .Please help me to solv my problem Im begging to all of you know how to fix this problem.