I am running windows 7 home premium on my HP machine. Today evening it shutdown abnormally and rebooted. The machine instantaneously hung up through a blank screen and no taskbar. Just the power push-button will shut it down. At what time the PC came up the second time there were more than a few new icons with a new Yahoo Chat pop-up on the desktop. Furthermore there were two White Smoke. At the same moment after every 50 to 60 seconds all the icons disappeared from the screen for a faction of sec. At the same time the taskbar vanished and take a sec to rebuild. Any system kind function such as Search or else Explore terminates at what time the desktop clears.
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