Hello,
Using Windows Search i got quite a few answers. Google doesnt have everything.
Svchost & Winss Processes Cause 100% CPU Utilization - Windows Live OneCare
That one talks about disabling some services which helped.
Re: svchost.exe 100% CPU Usage NEW prob solved - Windows Live OneCare
This one also offers a solution with regards to the telephony service.
Search Results
Check out more answer right from Microsoft's search page.
Cheers,
Mak