I have an issue with my system running XP Professional. If I have more than one window open at any time, each window will phantom click back and forth to each other as if I was clicking on each window with the mouse. I thought the issue might have been with the video card so I updated the driver which did not help and then I did a full system scan with my Avast IS ver.7 and it produced no infections. When I log into my Windows 7 partition, this issue does not occur. Not sure what may be causing this. Any help would be great. Thanks.