My mouse cursor keeps disappearing and I can't see it. It is there and if I move it to the right spot I can see that it highlights the icon or what ever it is on. I hit the control button to get the circle to show me where it is but it is still invisible on no specific program at all. I have to restart the computer for it to come back on. It has been happening more frequently lately but it does not seem to follow any pattern. Does anyone have any idea what is causing this?