Server Status Report WMI critical error

Warning - 9/7/2007 8:26:32 AM - System Processor Use Processor Queue Length > 8 System Processor Use : Warning condition. WMI Status: 0 Critical - 9/7/2007 8:27:13 AM - System Information Error Code (from WMI) System Information : Critical condition. WMI Status: 11 Critical - 9/7/2007 8:27:13 AM - System Information Error Code (from WMI) System Information : Critical condition. WMI Status: 11

System has locked up more than once recently no obvious explanation. message:

***Hardware malfunction call your hardware vendor for support *** the system has halted*** requires hard restart system reboots normally each time.

no relevant errors in Event Viewer.

Ran Dell Diagnostic utility no errors, ran Dell memory diagnostic util no errors,

Windows knowledge base article recommendations:

hardware diagnostics, check device drivers, update BIOS, install all available OS updates.

I've done all that.

Motherboard was replaced Nov. 06 with Dell refurb, DIMM slot broke in original board during memory upgrade. No issues till now. No other hardware changes.