What do I have to do to make my DLL able to be registered

If it isn't a COM dll you can't register it.

Thank you John.  I agree I wasted time following Kanti's links.

Marcoshadow: OK so I have what I think is a COM dll.  how can I use the Dll via VBA?

OK so I have what I think is a COM dll

Is it or isn't it?

What language is the dll written in?

it is written in VB.

I have never done this before.
I used the editor "Microsoft visual Basic 2008 Express Edition"
I created a new project of type Class library and in it I add a module/class

the code looks like this:
Option Explicit On

Public Class Zakaut_calculations
    Public ReadOnly Property Zakaut_Kids_Point(ByVal NumberOfKids As Integer) As Integer
        Get
            Return Calculate_Kids_Points(NumberOfKids)
        End Get
    End Property

    Public Function Calculate_Kids_Points(ByVal intNumkids As Integer) As Long
        If intNumkids > 0 Then
            Select Case intNumkids
                Case 1
                    Calculate_Kids_Points = 350
                Case 2, 3, 4
                    Calculate_Kids_Points = (350 + ((intNumkids - 1) * 150))
                Case Is > 4
                    Calculate_Kids_Points = (800 + ((intNumkids - 4) * 100))
                Case Else
                    Calculate_Kids_Points = 0
            End Select
        Else
            Calculate_Kids_Points = 0
        End If
    End Function
    Public Sub New(ByVal NumberOfKids As Integer)
        MsgBox("Class started/ended", vbOKOnly, " ")
    End Sub

    Protected Overrides Sub Finalize()
        MsgBox("Class started/ended", vbOKOnly, " ")
        MyBase.Finalize()
    End Sub
End Class

Thanks I have made progress with these instructions.

I am still getting an error that the function I am calling is not defined. but I am at least one or two steps closer than were I was.