WMI programming (Found a great helper)
Have a read on this article if you ever have to program WMI.
Although it is aBiztalk related post the WMI class generator works for every WMI class.
I had to delete a massive amount of BizTalk Service instances and generated a class for the BizTalk Service instances in minutes
within half anhour I had the BizTalkServiceInstanceDeletor running.
With the class generator you don't have to shy away from WMI programming. In fact it makes it all very easy.