When you generate a System Diagnostics Report using Windows Performance Monitor, it may report that no anti-virus product is installed in the system. Whereas the Windows Security Center or  Action Center (in Windows 7) detects the installed anti-virus product and reports its status correctly.

In Windows Vista SP1/2008 Server/Windows 7, the WMI Namespace "root\SecurityCenter" is deprecated, and programs are supposed to use the new Namespace "root\SecurityCenter2". Refer Alex’s post in comments section in article How to get Antivirus information with WMI (VBScript) – Decrypt my World. The KB980867 clearly states that as well. However, the Windows Performance Monitor seems to use the old namespace and fails to detect the installed anti-virus product. (c.f. useful post by Fisnik at MS Answers.)

MS might fix this issue in one of the updates, and until then simply ignore the Anti-Virus and Firewall part of the System Diagnostics Report.

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