WMI is organized into namespaces which work similar to subfolders. Here's a line that lists all namespaces you got:
PS> Get-WmiObject -Query "Select * from __Namespace" -Namespace Root | Select-O bject -ExpandProperty Name
Next, you could investigate all classes that live in one of these particular namespaces:
PS> Get-WmiObject -Namespace SecurityCenter2 -List
And then, once you know the classes, you could retrieve information, for example, about your installed AntiVirus protection:
PS> Get-WmiObject -Namespace root\SecurityCenter2 -Class AntivirusProduct
__GENUS : 2
__CLASS : AntiVirusProduct
__SUPERCLASS :
__DYNASTY : AntiVirusProduct
__RELPATH : AntiVirusProduct.instanceGuid="{108DAC43-C256-20B7-BB05-914135
DA5160}"
__PROPERTY_COUNT : 5
__DERIVATION : {}
__SERVER : TOBIASAIR1
__NAMESPACE : ROOT\SecurityCenter2
__PATH : \\TOBIASAIR1\ROOT\SecurityCenter2:AntiVirusProduct.instanceGui
d="{108DAC43-C256-20B7-BB05-914135DA5160}"
displayName : Microsoft Security Essentials
instanceGuid : {108DAC43-C256-20B7-BB05-914135DA5160}
pathToSignedProductExe : C:\Program Files\Microsoft Security Client\msseces.exe
pathToSignedReportingExe : C:\Program Files\Microsoft Security
Client\Antimalware\MsMpEng.exe
productState : 397312
PSComputerName : TOBIASAIR1
