Windows 10

[GeeGeeOH]

A meno che non la avevi comprata dallo store, non te la mostra sul sito.
Ci son degli script che ti estraggono la key dal PC, ma se è una riattivazione automatica ti mostrano la key generica.

Usavo questo una volta:

::' Windows RT 8.0 Product Key Dumper by Myria of xda-developers.com
::' Original Windows 8.0 VBScript by janek2012 of mydigitallife.info
::' Batch+VBScript hybrid trick by dbenham of stackoverflow.com
::' Fix for keys starting with N by Osprey00 of xda-developers.com
::'
::' Windows RT doesn't let unsigned VBScript use WScript.Shell, which is
::' required in order to read the registry in VBScript.  So instead, we
::' have a batch file call reg.exe to do the registry lookup for us, then
::' execute the VBScript code.  Might as well do things this way, since
::' it would really suck to write this math in batch...

::' --- Batch portion ---------
rem^ &@echo off
rem^ &call :'sub
::' If we were run from double-clicking in Explorer, pause.
rem^ &if %0 == "%~0" pause
rem^ &exit /b 0

:'sub
::' Read the registry key into VBScript's stdin.
rem^ &("%SystemRoot%\System32\reg.exe" query "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion" /v DigitalProductId | cscript //nologo //e:vbscript "%~f0")
::'rem^ &echo end batch
rem^ &exit /b 0

'----- VBS portion ------------
'WScript.Echo "begin VBS"

' Get registry data that was piped in
RegData = ""
Do While Not WScript.StdIn.AtEndOfStream
    RegData = RegData & WScript.StdIn.ReadAll
Loop

' Remove any carriage returns
RegData = Replace(RegData, ChrW(13), "")

' Split into lines
RegLines = Split(RegData, ChrW(10))

' Sanity checking on data
If (RegLines(0) <> "") Or (RegLines(1) <> "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion") Then
    WScript.Echo "Got invalid header trying to run reg.exe"
    WScript.Quit(1)
End If

If Left(RegLines(2), 38) <> "    DigitalProductId    REG_BINARY    " Then
    WScript.Echo "Got invalid value list trying to run reg.exe"
    WScript.Quit(1)
End If

' Get hex string
HexString = Mid(RegLines(2), 39)
If (Len(HexString) Mod 2) <> 0 Then
    WScript.Echo "Got an odd number of hex digits in REG_BINARY data"
    WScript.Quit(1)
End If

' Convert to byte array
Dim ByteArray()
ReDim ByteArray((Len(HexString) / 2) - 1)  ' VBScript is just weird with array dimensions >.<

For i = 0 To (Len(HexString) - 2) Step 2
    ByteArray(i / 2) = CInt("&H" + Mid(HexString, i + 1, 2))
Next

Key = ConvertToKey(ByteArray)
WScript.Echo Key

' janek2012's magic decoding function
Function ConvertToKey(Key)
    Const KeyOffset = 52 ' Offset of the first byte of key in DigitalProductId - helps in loops
    isWin8 = (Key(66) \ 8) And 1 ' Check if it's Windows 8 here...
    Key(66) = (Key(66) And &HF7) Or ((isWin8 And 2) * 4) ' Replace 66 byte with logical result
    Chars = "BCDFGHJKMPQRTVWXY2346789" ' Characters used in Windows key
    ' Standard Base24 decoding...
    For i = 24 To 0 Step -1
        Cur = 0
        For X = 14 To 0 Step -1
            Cur = Cur * 256
            Cur = Key(X + KeyOffset) + Cur
            Key(X + KeyOffset) = (Cur \ 24)
            Cur = Cur Mod 24
        Next
        KeyOutput = Mid(Chars, Cur + 1, 1) & KeyOutput
        Last = Cur
    Next
    ' If it's Windows 8, put "N" in the right place
    If (isWin8 = 1) Then
        keypart1 = Mid(KeyOutput, 2, Cur)
        insert = "N"
        KeyOutput = keypart1 & insert & Mid(KeyOutput, Cur + 2)
    End If
    ' Divide keys to 5-character parts
    a = Mid(KeyOutput, 1, 5)
    b = Mid(KeyOutput, 6, 5)
    c = Mid(KeyOutput, 11, 5)
    d = Mid(KeyOutput, 16, 5)
    e = Mid(KeyOutput, 21, 5)
    ' And join them again adding dashes
    ConvertToKey = a & "-" & b & "-" & c & "-" & d & "-" & e
    ' The result of this function is now the actual product key
End Function

Ho un vago ricordo che da qualche parte nel pannello di controllo forse ti mostra le ultime lettere.
NB: -3V66T è la Pro generica.