Here's a little VBSCRIPT that verify each Computer in LanSweeper DB against its presence in Active Directory. If the computer is not in AD, it is remove from Lansweeper DB.
This Script must be run under an account with the correct rights on the DB. There is no error trapping nor validation in the script.
Here's the code:
Dim objCNSQL
Dim strSQLDELETE
Dim strSQLQUERY
Dim objRSSQL
Dim SQLName
Const ADS_SCOPE_SUBTREE = 2
strSQLQUERY="select * from tblcomputers" 
' **************** AD Connection ****************************
'
Set objCNAD = CreateObject("ADODB.Connection")
Set objCommand =   CreateObject("ADODB.Command")
objCNAD.Provider = "ADsDSOObject"
objCNAD.Open "Active Directory Provider"
Set objCommand.ActiveConnection = objCNAD
objCommand.Properties("Page Size") = 1000
objCommand.Properties("Searchscope") = ADS_SCOPE_SUBTREE 
' **************** LAnsweeper connection ****************************
' * Replace SERVERNAME by your SQL Server Instance
'
Set objCNSQL=CreateObject("ADODB.Connection")
objCNSQL.Open "Provider=SQLOLEDB.1;Persist Security Info=False;Integrated Security=SSPI;Server=SERVERNAME\sqlexpress;Database=Lansweeper32"
' **************** REading Lansweeper ****************************
'
set objRSSQL=objCNSQL.execute(strSQLQUERY)
' ******************************************************************
' *     For each record in tblcomputers
' *       If computername exist in AD, do noting
' *       Else, delete the record in the DB
' *
' *  REplace COMPANY, COM by your DOMAIN
'
objRSSQL.MoveFirst
Do Until objRSSQL.EOF
SQLName=objRSSQL("Computername") 
    
    objCommand.CommandText = "SELECT Name FROM 'LDAP://dc=COMPANY,dc=COM' WHERE objectCategory='computer' AND Name='" & SQLName & "'"
    Set objRSAD = objCommand.Execute
    On Error Resume Next
     objRSAD.MoveFirst
    if(err.number<>0) then
      Wscript.Echo "DELETING: " & SQLName
      strSQLDELETE="Delete from tblcomputers where ComputerName='" & SQLName & "'"
      objCNSQL.execute(strSQLDELETE)
    else
      Wscript.Echo "Keep: " & SQLName
    end if
    objRSSQL.MoveNext
Loop
objCNSQL.Close