If you’re planning on doing a re-installation of Windows, it’s a good idea to make a backup of your product key. If the Certificate of Authenticity has become unreadable due to wear and tear and you don’t have a note of it anywhere else then this simple script will tell you what your product key is.
Copy the following script into notepad:
Set WshShell = CreateObject("WScript.Shell") MsgBox ConvertToKey(WshShell.RegRead("HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\DigitalProductId")) Function ConvertToKey(Key) Const KeyOffset = 52 i = 28 Chars = "BCDFGHJKMPQRTVWXY2346789" Do Cur = 0 x = 14 Do Cur = Cur * 256 Cur = Key(x + KeyOffset) + Cur Key(x + KeyOffset) = (Cur \ 24) And 255 Cur = Cur Mod 24 x = x -1 Loop While x >= 0 i = i -1 KeyOutput = Mid(Chars, Cur + 1, 1) & KeyOutput If (((29 - i) Mod 6) = 0) And (i <> -1) Then i = i -1 KeyOutput = "-" & KeyOutput End If Loop While i >= 0 ConvertToKey = KeyOutput End Function
Save this as productkey.vbs ensuring that you change the “Save as type” to “All Files”.
Then run this script by double clicking it, a popup window will reveal your product key.