Private Sub Command0_Click()
On Error GoTo Err_Command0_Click

Dim objshell, path, DigitalID, Result
Set objshell = CreateObject("WScript.Shell")
'Set registry key path
path = "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\"
'Registry key value
DigitalID = objshell.RegRead(path & "DigitalProductId")
Dim ProductName, ProductID, ProductKey, ProductData
'Get ProductName, ProductID, ProductKey
ProductName = "Product Name: " & objshell.RegRead(path & "ProductName")
ProductID = "Product ID: " & objshell.RegRead(path & "ProductID")
ProductKey = "Installed Key: " & ConvertToKey(DigitalID)
ProductData = ProductName & vbNewLine & ProductID & vbNewLine & ProductKey
'Show messbox if save to a file
MsgBox ProductData, , "BackUp Windows Key Information"

Exit_Command0_Click:
    Exit Sub

Err_Command0_Click:
    MsgBox Err.Description
    Resume Exit_Command0_Click

End Sub


'Convert binary to chars
Private Function ConvertToKey(Key)
    Const KeyOffset = 52
    Dim isWin8, Maps, i, j, Current, KeyOutput, Last, keypart1, insert
    'Check if OS is Windows 8
    isWin8 = (Key(66) \ 6) And 1
    Key(66) = (Key(66) And &HF7) Or ((isWin8 And 2) * 4)
    i = 24
    Maps = "BCDFGHJKMPQRTVWXY2346789"
    Do
           Current = 0
        j = 14
        Do
           Current = Current * 256
           Current = Key(j + KeyOffset) + Current
           Key(j + KeyOffset) = (Current \ 24)
           Current = Current Mod 24
            j = j - 1
        Loop While j >= 0
        i = i - 1
        KeyOutput = Mid(Maps, Current + 1, 1) & KeyOutput
        Last = Current
    Loop While i >= 0
     
    If (isWin8 = 1) Then
        keypart1 = Mid(KeyOutput, 2, Last)
        insert = "N"
        KeyOutput = Replace(KeyOutput, keypart1, keypart1 & insert, 2, 1, 0)
        If Last = 0 Then KeyOutput = insert & KeyOutput
    End If
     

    ConvertToKey = Mid(KeyOutput, 1, 5) & "-" & Mid(KeyOutput, 6, 5) & "-" & Mid(KeyOutput, 11, 5) & "-" & Mid(KeyOutput, 16, 5) & "-" & Mid(KeyOutput, 21, 5)
    
End Function

ดัดแปลงจาก http://winaero.com/blog/how-to-view-your-product-key-in-windows-10-windows-8-and-windows-7/

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