Typed letters do not appear on screen

Hi all,
When typing in email, password windows, etc etc many times what I type does not appear on screen. Very frustrating when filling out a password or anything. I at first thought it was my wireless keyboard. Not, I have tried multiple wireless keyboards and when that did not work I switched back to a wired keybaord and it still does it. Not all the time but quite frequently.
ANy suggestions will be appreciated.
C

You're probably not "clicked in" to the right form. It's an annoying part of using all computers.