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How to Find Windows 10 Lost Product Key

Even though you can get Windows 10 free upgrade now if you are Windows computer user, and are able to successfully upgrade official Windows 7 or Windows 8 to Windows 10, Windows 10 product key seems to be not important for you because you don't need to activate windows 10 manually. However, if you get a new computer preinstalled with Windows 10, and now you want to reinstall it to solve some system problems, Windows 10 product key will be necessary during reinstallation.

Now follow the article, you will get two effective methods to find Windows 10 product key in system registry after installation.

Method 1: Find Windows 10 Product Key with Product Key Finder

The following are 3 steps to find Windows 10 lost product key with iSunshare Product Key Finder, which could effectively help to recover product keys for Windows/Office/Adobe/IE/SQL Server/VMware/Exchange Server and Visual Studio etc.

Step 1: Download and install iSunshare Product Key Finder on computer Windows 10 installed.

install iSunshare Product Key Finder to find windows 10 product key

Step 2: Run it and click Start Recovery button on bottom menu.

start to recover windows 10 product key

Note: If you are using Product Key Finder trial version, now you would get a message on pop-up dialog, prompting you to Order Full Version or Enter Registration Code in order to find all Windows 10 product key codes.

Step 3: Preview and save Windows 10 product key and other software product keys.

In the middle part of Product Key Finder, you can see Windows 10 product key and product ID. Just click Save To File button, and browse a location to save Windows 10 product key. Now you can reinstall Windows 10 on computer with this product key.

preview windows 10 lost product key

save windows 10 product key

Tips: If that is not Product Key Finder full version, users only could preview Windows 10 partial product key codes in this part.

Even if Windows 10 is running normally on your computer, Windows 10 users could also run iSunshare Product Key Finder to get Windows 10 product key and make a backup. So you can take it no matter you want.

Method 2: Find Windows 10 Product Key with VB Script

If you don't want other software to find Windows 10 lost product key, try VB Script please. VB script can read the value out of the registry and then translate it into the format that you need for reinstalling.

Step 1: Copy and paste the following scripts in 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

Step 2: Save the notepad as "windowsproudctkey.vbs".

1. Click File > Save As in Notepad.

choose save as option in notepad

2. Choose "Save as type" All Files in Save As window, and name it windowsproductkey.vbs. Then save it to the desktop for easy access.

save as vbscript file

Step 3: Double-click "windowsproductkey.vbs" and pop-up window shows Windows 10 product key.

find windows 10 product key with vbscript

Compared to first method, you would find it is more difficult for computer newbies to recover Windows 10 product key with second method. With product key finder tool, just one click could find out Windows product key. But with VBscript, nothing is allowed to be wrong in script, otherwise it would not successfully read Windows 10 product key stored in system registry.

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