(and is REALLY NECESSARY in order to offer more than a guess) that you take the time to tell us the type of computer (desktop, laptop, mainframe, etc.) and the Operating System (Unix, BSD, DOS, Mac version nnn, Amiga, Linux, QNX, Windows version and SP level if applicable) as all are different.
On the assumption that yours is a Windows based PC open the Control Panel then the Keyboard applet. Now make sure that English US (or whatever you originally used) is selected as the language and keyboard as follows ...
As a user with Administrator rights click Start, Control Panel, Keyboard applet icon.
Click Hardware tab, ensure keyboard Type is selected and click Properties.
From the Date, Time, Language and Keyboard option and Regional Options tab, set Location to United States and click OK.
Right click the EN icon on the Task Bar.
Select English [United States]
hi every one i have a problem my 15 month old son played with my computer and changed and settings on my keyboard. Some of the keys do not show what they are supposed to show like the one with quotation marks and the one on the right side of letter P, it seems that only the ones with signs on them changed and not all of them only do not work in Capslock like the comma key, please help