I don't really know where to start, We have a small office and recently replaced all our PCs. With new Dell Windows 7 PC's. 2 users so far have had problems where they will be typing and it will not exactly stall. I've seen before in other cases where I'll be typing and some computer will stall and I'll look up and then the computer will catch up and what i had typed will start appearing on the screen. this isn't exactly whats happening. Whats happening is it'll stall and nothing will be typing on screen and most keys will do nothing you can hit enter a few times and then the cursor will move down a few lines. One example a user was trying to type KGAN and what typed was k and nothing else. Its pretty random like that and on more then one PC. I can't think of what to look at.