CPU usage constant, won't shutdown

[crofter]

CPU usage constant at 50% - all checks with AVG, Asquared, Ad-aware, Spybot, Spywareblaster, WINDefender all negative. CPU usage not attributable in task manager. Won't shutdown/restart with power off. Updated all drivers. WinXP home with SP3 and all updates correct as per Belarc advisor. Intel Core2 6600@2.40ghz, 3gb memory. Removed/replaced all memory sticks, removed/replaced all video and PCI cards. Only error in device manager was USB audio device associated with terratec cynergy hybrid usb stick which now removed. PC wizard 2008 show no problems. Hijackthis log attached

 

[boykov]

Hi
i would suggest 2 things to start...

start>run>
type this: sfc /scannow (this will check the file system, if errors are found will replace with original, most likely will require xp cd)

if the above does not help try Registry Mechanic

cheers

PS: have you tried running the system in "diagnostic startup" ... start>run>msconfig