For what it's worth, I had the same problem about a month ago. It was
svchost.exe that was spiking the CPU. Did some trial and error with
services and couldn't nail it down. It lasted about 2 weeks
(intermittently) and has now not reared its ugly head for a couple of
weeks now.

I think I read somewhere that it was a conflict with the virus app? I'm
using eTrust. Not sure, but possibly an update fixed it? Good luck!
-scaudill



Russell Jesson wrote:
Vista Basic Machine started running very slowly and when I looked in Task
Manager svchost.exe was using a 100% CPU. Using system internals process
explorer it’s the network service containing crytsvc, dnscach, KtmRm, NlaSvc,
Tapisrv and Termservice.

Looking inside the thread that is using the CPU is ntdll.dll

I’ve ran all virus and spyware checkers I can and all show no problems. I’ve
booted in safe mode and cleared all the softwaredistribution folder. The slow
running does not affect safe mode but as the service is not started no great
surprise. Windows Update doesn't work in safe mode either, thanks Microsoft.

I tried to update AVG virus checker but it wanted KB929547 applied so I
downloaded it and tried to run but after several hours all I got was install
failed with 0x800706bb

Any ideas??