Hi DavidR,
Think the man should analyze with Process Explorer, just what is going on, together with netstat from a dos prompt.
Is something trying to access from within to the outside, is his firewall alarming, can he analyze his startup list. If he does not see much idle CPU action, actually hearing and seeing the red or orange led on his console flickering in pace, there is not much to worry. He could check up what a scandisk total is giving out in between sessions. Rule of thumb: do you have the 8.192 = right. I should go inside ZA look at what the programs settings are, some green or red, better reset to all blue question marks. This has been at the root of many an unexplained problem. Same as with a browser seting, you permit googlesyndication with NoScript in stead of the main site, trouble awaits you,
polonus