My cursor moves on its own to the top left of the screen, it does it while typing in a variety of applications with greater and lesser frequency. It happens if the mouse is turned off. I have googled this and applied a variety of solutions including: reinstalling the driver; changing Mouse configuration (to auto select box, turn off cursor while typing etc) uninstalling RealTek Audio HD (!) and uninstalling various applications which I had installed around the time the issue emerged (about 6 weeks ago). When at its worst it renders the PC unusable. Any help?