Fix for SVCHost at 100% CPU
Blog info:
http://blogs.technet.com/wsus/archive/2007/05/15/srvhost-msi-issue-follow-up.aspx
What you need:
1) Microsoft KB 927891 - link
2) Build 0374 AU client/ WSUS 3.0 client: - link
Other related too: Microsoft (SysInternals) Process Explorer - link