Incase anyone else needs this, here is a vbs script to remove SAV from Windows Security Center. Thanks for pointing me in the right direction with Wbem!

<blockquote>
'*******************************************************************************
'* Script:         RmvSavWSC.vbs
'* Purpose:        Removes Sav from Windows Security Center
'* Parameters: 
'*                 1 - iMsgMode
'*                     (0 = Minimal Messages ; 1 = Display Debug Messages;
'*                      2 = Login Script No Msgs) - Default = Minimal Msgs
'* Returns:        0 - If sucessful Sav removed or sav not detected
'*                 1 - If error removing sav
'* Created:        2009/09/15
'* Created by:     Chris Thibeau
'* Supported OS:   XP
'*******************************************************************************

Option Explicit 

'* ------------------------- Global Variable Declarations ------------------------------
Dim iMsgMode, strComputer, oWMI, colAV, objAntiVirusProduct, strAVGuid, strCompany, strAV, strScanning, strUptodate, strMsg, objSWbemServices, strInstance, Err

'------------------------------------- Get Arguments ---------------------------------------------
If WScript.Arguments.count = 1 then           '1
    iMsgMode = WScript.Arguments.Item(0)
Else                                        
    iMsgMode = 0
End if

'============================== Main Script =============================

'--- Connect to WMI \root\SecurityCenter\AntiVirusProduct
strComputer = "."
Set oWMI = GetObject("winmgmts:{impersonationLevel=impersonate}!\\" & strComputer & "\root\SecurityCenter")
Set colAV = oWMI.ExecQuery("Select * from AntiVirusProduct")
   
    '--- Check to see if any AV products are registered with Windows Security Center
    If colAV.Count > 0 Then
   
        ' --- Start loop for each AV product
        For Each objAntiVirusProduct In colAV
       
            ' -- Get the Guid
            strAVGuid = objAntiVirusProduct.instanceGuid
       
            ' -- Select the AV product and get it's details
            Set colAV = oWMI.ExecQuery("Select " &  strAVGuid & " from objAntiVirusProduct")
           
            strCompany = objAntiVirusProduct.companyName
            strAV = objAntiVirusProduct.displayName
            strScanning = objAntiVirusProduct.onAccessScanningEnabled
            strUptodate = objAntiVirusProduct.productUptoDate
       
            strMsg = "This information was collected on: " & Date & " at " & Time & vbCrLf
            strMsg = strMsg & "GUID: " & strAVGuid & vbCrLf
            strMsg = strMsg & "Manufacturer: " & strCompany & vbCrLf
            strMsg = strMsg & "Product: " & strAV & vbCrLf
            strMsg = strMsg & "Scanning Enabled? " & strScanning & vbCrLf
            strMsg = strMsg & "Definitions UptoDate? " & strUptodate & vbCrLf
            strMsg = strMsg & vbCrLf
       
            If iMsgMode = 1 Then
                WScript.Echo strMsg
            End If
       
            ' -- Check to see if the AntiVirusProduct.companyName = Symantec
            If StrComp(strCompany,"Symantec Corporation") = 0 Then
                If iMsgMode = 1 Then
                    WScript.Echo "SAV Detected: " & strAVGuid & vbCrLf & " removing from WSC!"
                End If
           
                ' -- Setup a connection to Wbem then delete Sav Instance
                strInstance = "AntiVirusProduct.instanceGuid='" & strAVGuid & "'"
                Set objSWbemServices = GetObject("winmgmts:\\" & "." & "\root\SecurityCenter")
                objSWbemServices.Delete strInstance
           
                If Err <> 0 Then ' -- Check if error deleting instance
                    If iMsgMode = 1 Then ' - Display error message
                        WScript.Echo "Error Deleting Sav Instance:" &  vbCrLf & Err.Number & "    " & Err.Description
                    End If ' - Display error message
                Else
                    If iMsgMode < 2 Then ' - Display success message
                        WScript.Echo "Delete succeeded"
                    End If ' - Display success message
                End If ' -- Check if error deleting instance

                ' Release SwbemServices object
                Set objSWbemServices = Nothing
           
            End If
       
        next ' --- process next AV product
       
    Else ' --- No AV products are registered
        If iMsgMode = 1 Then ' - Display message
            WScript.Echo "No Anti Virus Products registered"
        End If ' - Display message   
    End If
   
' --- Release all resources
Set objAntiVirusProduct = Nothing
Set colAV = Nothing
Set oWMI = Nothing

If Err <> 0 Then
    WScript.Quit(0) ' --- Quit, no errors
Else
    WScript.Quit(1) ' --- Quit with errors
End If

</blockquote>