A:AnswerYou issue here is that your basic driver set that is park of the Win7 is missing few compatibility features. What you need to do is find the manufacturer drives for your OS and install them. You will see that everything will work then. Look on HP support site the available downloads for that particular HP keyboard.
A:AnswerCheck the ports and interrupts they are taking. It sounds like they are conflicting that way.
You can also try moVing your switch to another USB. I have run into that often too. So much that I avoid'd useing any extra switching methods!