Rebuild WMI 

We have sometimes found the WMI classes are blank or corrupt.

The following steps can rebuild your WMI

Disable and stop WinMgmt service

rename C:\windows\system32\wbem\repository

Enable the WinMgmt Service

change path to c:\windows\system32\wbem

run for /f %s in ('dir /b *.mof) do mofcomp %s

run for /f %s in ('dir /b en-us\*.mfl') do mofcomp en-us\%s