I've replaced both hard drives, the motherboard, the memory sticks andThat disk activity is a huge clue. I don't have the answer, sorry, but
if you can get Process Explorer or similar tool to either log the disk
activity during those times, or show the activity to you in real time
if possible, you might be closer to tracking it down. It would be nice
to know exactly which files are being accessed, by which process (not
just svchost.exe), and why it's running at such a high priority that
it locks out all other disk I/O.
I had a system here a few weeks ago that behaved exactly as you
described above, but in that case Event Viewer showed tons of hard
drive interface errors and timeouts. I replaced the appropriate SATA
cable and the problems disappeared. Your problem, despite it's
similarity to what I saw, appears to be software-related. Still, I try
to make it a point to visit Event Viewer and drill down into Windows
Logs, System, then filter out everything except the Critical, Warning,
and Error events. Sometimes that can be very enlightening.
the CPU. I have run Norton Utilities 15 several times and checked
these out but never found any problems. Would a flawed SATA cable not
cause the hard disk to malfunciton in a way that Norton Utilities 15
Norton usually shows a problem with one of the svchost.exe funtions
but it doesn't get specific. Norton will show a high disc read
activity, usually in the100 to 200 MB (total for this process) but it
doesn't identify the process that is causing this high disk activity.
Another page on the Norton Utilities 15 scan results shows
I can't read the end part of the above item but maybe this will be
enough information to give you some idea of what it is talking about.
Norton Utilities 15 also shows a Scan Result problem from time to time
indicating that there was one item found and one item ignored. I took
this to mean that the item wasn't a serious problem.