Multimedia Keyboard

I have Vista for Business and a couple of different Microsoft Wireless
keyboards, one is a Multimedia Keyboard 1.1, the other is a Wireless 4000.
Both exhibit the same symptoms, which are that I will press a key once and
that key will then, with no warning repeat itself numerous times (up to 20).
This happens with any
keystroke, whether it be a character or a command key or a combination such
as Ctrl-Z. As you can imagine, this is incredibly annoying, and it is
completely unpredictable. This problem arises despite having installed the
latest Intellitype drivers.

Any thoughts on why this happens or how to stop it?

--
Michael Karlin