The pc is behaving badly. It is freezing every few seconds and the display blinks slightly during the freeze. So when you are moving the mouse it freezes and your movement become tough to control. I installed the latest video driver, that did not do anything. I reviewed the memory usage - don't think that is the problem. Had the registry cleaned and PC cleaned up by virus programmes etc, nothing has worked. Going completely nuts because can not work on it without constant delays. Its every few seconds.