Why are you getting numbers appearing on screen when you type letters on your computer keyboard? Try pressing a FN key with a Num Lock, a Shift key & Num Lock, CTRL Key & Num Lock, ALT key & NUM Lock. Do k, l, m, and n key have numbers printed on those keys themselves? If you have an IBM Thinkpad there is a key that will turn on numbers lock on, and it may have been pressed by accident.
You may have numlock turned on accidentally. If it's an external keyboard and not laptop keyboard, you can unplug it and plug it back in. If it's a USB external keyboard you can try plugging it into a different USB port.
If you have a laptop press a scroll lock key. Try holding down a FN function key while pressing a scroll lock key. Hopefully, your numlock key is no longer locked.
About Author Aaron J. Berg
Aaron J. Berg is the owner of Anet Computers, host of the Reality PC podcast, and blogger at AnetComputers.com. For over thirteen years, he worked for fortune 500 companies and the United States Federal government supporting computers. Now he helps you solve your most common computer problems.