We have Windows XP on one of our office laptops. For some reason out
of the blue any time we press C on the keyboard My Computer opens and
pressing D opens the Calculator program. No other keys open anything
else.

We've run a number of different virus scans, spyware programs,
HiJackThis etc and have found nothing. System Restore gives us a
"System Restore Incomplete" message each time.

Does anyone have any ideas what might be causing this?

managed to fix it - two screws on the underside of the laptop needed
loosening a couple of turns.