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Might give this a try-right click on your Computer icon-click on Properties-then click on Device Manager. The keyboard is listed there. If it has a yellow exclamation point, or a yellow question mark, then there is a problem. Click on the arrow in front of Keyboards, then right click on the drop down named keyboard. There you can click on update drivers. That should solve the problem.
You may accidentally have turned NumLk on which causes the keys on the right part of the keyboard to act as a keypad for entering numbers. A little padlock with the number 1 in its middle is the indicator for NumLk and it will be lit or a LED bar underneath it will be lit when NumLk is on. On the Acer Aspire One 8.9" screen model ZG5, the NumLk is toggled on/off by holding down Fn and pressing the F11 key. Also, when NumLk is on, pressing U I O gets 4 5 6 and J K L M gets 1 2 3 0. The reason for embedding the numeric keypad within the usual character keys eliminates having a separate set of keys for the keypad function resulting in a more compact keyboard that better fits with notebook computers such as the netbooks which have smaller screen sizes.
NumLk must be on for the numeric keyboard to input the numbers on the keys otherwise the keys default to the functions marked at the lower part of the keys. To turn on NumLk, just press the NumLk key on the top row of keys above the numeric keyboard.
try to access command prompt outside of windows using the operating system disc. (by booting to cd and go to repair your computer options then select command prompt) if the keyboard works fine on command prompt, there's no issue with the hardware. but if it still doesnt work, you will need to replace the keyboard.