WMI troubleshoot..

acces test command to compuername

wmic /node:compuername cpu list brief

http://support.adminarsenal.com/entries/78992-wmi-access-denied


maybe you'll occured  Access denied error , find out this link.
http://support.microsoft.com/kb/948829


describing a WMI API and troubleShooting about RPC error

http://servermonitor.tistory.com/tag/server

http://www.ks-soft.net/hostmon.eng/downpage.htm

Utility for WMI