I have a acer aspire one, some of my key...

The connection between your keyboard and computer is probably lose. The best way to solve this is to unplug the keyboard and plug it back in.

If your computer is still under warranty call tech support and have them talk you through it. If not take it to a computer store and have them do it. I don't recommend doing this without some who knows exactly how your computer and keyboard are connected.

If your computer git wet or took a bad fall some of the connections may be completely broken. This meas the your whole keyboard would need to be replaced.