Playing with Application Center Test on my XP machine, hitting a Windows Server 2003 machine. Getting the error Could not bind to Windows Management on a test client.

This article seems to fix the problem.

PRB: Error Message: Could Not Bind to Windows Management on a Test Client

If this article is dead someday, quick answer:

• open the WMI Control MMC snap-in
  
• grant "ACTUser" full control of the following node: root\CimV2\Applications\MicrosoftACT