Hello, from time to time my PC 'acts up' in the way that suddenly and without obvious provocation there is violent, and I use the word 'violent' judiciously, activity on the c:/ drive such that the LED is lit continuously (it doesn't blink rapidly but is lit as if powered by a 5 volt battery - that's how busy the drive is) and the PC is also obviously 'elsewhere occupied' so that mouse-clicks are maddeningly slow to register and the desired action as well, or else simply ignored (stack overflow! whoa!!). This is, to put it mildly, irritating and I am damned if I can see any reason for this volcanic, hammer-and-tongs activity. A look in Task Manager under Processes shows nothing suspect or out of the ordinary. I have had this happen before but then it turned out that the machine was remote-controlled from Khazakstan and employed in a DDOS-attack against some local government agency; a Trojan infection which the Kaspersky Rescue Disk took care of. But this intense diskactivity happens even when I'm not infected or even online and I would very much like to know what's going on. There is probably a good reason but I bought and paid dearly for the PC and I want full control. Any ideas on how to find out (excepting task Manager) what's going on under the hood? Thank you.