This is late but as it was not a separate thread, if you're still reading, there isn't really a way of fixing this if it hasn't happened like right this second. Sometimes when it happens, if you properly dry out the keyboard, usually for several days, without use, sometimes a lot of functions can recover though I've always had at least one key that remained stubbornly unresponsive or kept messing up. Otherwise, replacement of a keyboard is what you're left with. This can be tricky on laptops, but usually quite doable (unless it's a tablet or mac air or some such thing with no ability to exchange components). On desktops, if it's a gaming keyboard, see about warranties, otherwise just get another. Keyboards, the regular ones, are pretty cheap.