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Found this:

POSSIBLE PROBLEM #2- I’m using the normal keyboard that’s part of my laptop, but whenever I try to type on the right side of my keyboard, (or sometimes) the letter that should come out on the screen (such as ‘m’) is not there, and instead there’s something different! (Like 0 for ‘m’, or 2 for ‘k’, or 3 for ‘j’) I’ve tried installing new drivers and other stuff, and it’s still not working! WHAT’S GOING ON???

ANSWER!
Here’s yer problem, buddy. Your computer thinks you have the ‘Fn’ key (otherwise known as the function key) held down right now, even though you don’t! You can tell that this is the problem if the letters/numbers which come out on the screen are the ones which are noted on the lower part of the keys you’re pressing. And you’ll notice that if you actually hold down the ‘Fn’ key, your computer’s keyboard acts as it normally does.

So why does the computer think the ‘Fn’ key is being held down, even when it’s not? Because you have ‘Num Lock’ on! When you have the ‘Num Lock’ key on, your computer perpetually thinks that the Fn key is held down.

Here’s how to turn ‘Num Lk’ off if you want your keyboard acting normal again: hold ‘Fn’ and hit the ‘Num Lk’ button. (You have to hold Fn while doing this, because otherwise, the computer would think you were trying to press ‘Scr Lk’, or scroll lock. I don’t know the layout of every keyboard of every computer sony has ever made, so it might be different for you.), after that, everything should work normal again. For some reason, Sony Vaio laptops, on the rare occasion turn their ‘num lock’ on by themselves. It’s easy as it can be to turn it back off, it’s just that it can be very confusing for someone who doesn’t understand the problem.

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