VB.NET - Get product key for Windows 7 and 8

Hi,

For a software reinstallation program i'm making I would like to collect the current product key from Windows 7 and 8 so it can be automatically be re-used by my application.

Now I have found multiple examples but none of them seem to work...

I have tried below code but this always results in "N/A", the variable Hexbuf is empty but I don't understand why.

Public Function GetProductKey(ByVal KeyPath As String, ByVal ValueName As String) As String

        Dim HexBuf As Object = My.Computer.Registry.GetValue(KeyPath, ValueName, 0)

        If HexBuf Is Nothing Then Return "N/A"

        Dim tmp As String = ""

        For l As Integer = LBound(HexBuf) To UBound(HexBuf)
            tmp = tmp & " " & Hex(HexBuf(l))
        Next

        Dim StartOffset As Integer = 52
        Dim EndOffset As Integer = 67
        Dim Digits(24) As String

        Digits(0) = "B" : Digits(1) = "C" : Digits(2) = "D" : Digits(3) = "F"
        Digits(4) = "G" : Digits(5) = "H" : Digits(6) = "J" : Digits(7) = "K"
        Digits(8) = "M" : Digits(9) = "P" : Digits(10) = "Q" : Digits(11) = "R"
        Digits(12) = "T" : Digits(13) = "V" : Digits(14) = "W" : Digits(15) = "X"
        Digits(16) = "Y" : Digits(17) = "2" : Digits(18) = "3" : Digits(19) = "4"
        Digits(20) = "6" : Digits(21) = "7" : Digits(22) = "8" : Digits(23) = "9"

        Dim dLen As Integer = 29
        Dim sLen As Integer = 15
        Dim HexDigitalPID(15) As String
        Dim Des(30) As String

        Dim tmp2 As String = ""

        For i = StartOffset To EndOffset
            HexDigitalPID(i - StartOffset) = HexBuf(i)
            tmp2 = tmp2 & " " & Hex(HexDigitalPID(i - StartOffset))
        Next

        Dim KEYSTRING As String = ""

        For i As Integer = dLen - 1 To 0 Step -1
            If ((i + 1) Mod 6) = 0 Then
                Des(i) = "-"
                KEYSTRING = KEYSTRING & "-"
            Else
                Dim HN As Integer = 0
                For N As Integer = (sLen - 1) To 0 Step -1
                    Dim Value As Integer = ((HN * 2 ^ 8) Or HexDigitalPID(N))
                    HexDigitalPID(N) = Value \ 24
                    HN = (Value Mod 24)

                Next

                Des(i) = Digits(HN)
                KEYSTRING = KEYSTRING & Digits(HN)
            End If
        Next

        Return StrReverse(KEYSTRING)

    End Function

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I also tried to use below code which is actually for Windows XP, this gives met the result "bbbbb-bbbbb-bbbbb-bbbbb-bbbbb"

Public Function sGetXPKey() As String
    Dim result As String = String.Empty

    Dim RegKey As RegistryKey = _
    Registry.LocalMachine.OpenSubKey("Software\Microsoft\Windows NT\CurrentVersion", False)
    Dim bytDPID() As Byte = RegKey.GetValue("DigitalProductID")
    Dim bytKey(14) As Byte
    Array.Copy(bytDPID, 52, bytKey, 0, 15)
    Dim strChar As String = "BCDFGHJKMPQRTVWXY2346789"
    Dim strKey As String = ""

    For j As Integer = 0 To 24
        Dim nCur As Short = 0
        For i As Integer = 14 To 0 Step -1
            nCur = CShort(nCur * 256 Xor bytKey(i))
            bytKey(i) = CByte(Int(nCur / 24))
            nCur = CShort(nCur Mod 24)
        Next
        strKey = strChar.Substring(nCur, 1) & strKey
    Next

    For i As Integer = 4 To 1 Step -1
        strKey = strKey.Insert(i * 5, "-")
    Next

    Return strKey
End Function

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Can someboday please help me? i'm a database application programmer so this is new to me.

Thanks