Thanks for the suggestions no solution yet but more information.

The sysinternals process explorer has shown it’s a single thread causing the
problem and it’s identified as ntdll.dll!RtlUserThreadStart Killing this
thread fixes the problem but it returns on a reboot or possibly restart of
the service(s) I’ve only tried cryptsvc so far but that causes the problem to
reoccur.

Tried the Kernrate as suggested and it is showing ntkrnlpa with fltmgr
second but the first it 80% the second was 4%.

Looking at the stack information from process explorer I see top of the list
ntkrnlpa.exe!KiUnexpectedInterrupt+0x40

Also I’ve updated all the drivers on the system and anything else I can
think of with no effect.


"AJR" wrote:

take a look at http://blogs.technet.com/markrussinovich/rss.xml

Scroll down for Mark's post on solving CPU spikces.


"Russell Jesson" Russell wrote in message
...
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??