Check and see if the function key has been activated. It will be located somewhere on the keyboard and a light should be on if you have pressed or activated it. If it is on, it will change how some keys work.
I have a problem with the keyboard on an Acer laptop. When you press the " P " key, in any application ( tried Word, Excel, WordPad, NotePad ) it gives the following " p' ". If you hold down the tab key and press " P " you get " P+)* " or else it opens a dialogue box. I have tried re-installing the keyboard drivers.