edwalt's - Things I Wish I'd known about SBS 2003....
Management Packs are often upgraded or modified without us knowing it. In this case the MOM Backwards Compatibility pack v.6.5000.00 and the Dell Management pack v1.0 were the packs currently installed on the SCOM server.
After removing the Dell management Pack the CPU spikes disappeared.
Please remember : With step one, once you download and run the .MSI, this will only extract the new MP's to a folder on the servers hard drive. You must then import the new MP's to make them available.
If you are not sure whether the Management Packs imported correctly or not:
How do I import newer Mangement Packs?
If an MP has already been installed you will see a message returned stating that fact.