How to Find Lost Windows Product Key

Everybody knows that product key is a must to reinstall or activate Windows. If you are ready to reinstall Windows but can't find your product key, things seem tricky. Actually, it's not. You still can retrieve it by some easy methods.

The product key is stored in the Registry once Windows installation is complete. But it's not so easy to find it unless you are very familiar with computer knowledge. Even if you find it, it's impossible to read the product key because it's in a binary format. Then how the hell can you find your lost Windows product key? Here are two very easy methods.

Method 1: Find Windows product key by VBscript file

If you still can boot your Windows normally, you can create a simple VBscript that can read the product ID value from Registry and translate it into the product key format you can read.

Step 1: ?Copy and paste the following statement into a 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



Cur = 0

x = 14


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 file to .vbs file

How to Find Lost Windows Product Key

Click File->Save As. Change the Save as type to All Files and name it something ending with the vbs extension, such as productkey.vbs. Then click the Save button to save the file.

Step 3: Find Windows product key

How to Find Lost Windows Product Key

Double click the VBscript script file. Then it will immediately pop up a small window showing your Windows product key.

Step 4: Find Windows Product key with iSumsoft Product Key Finder

How to Find Lost Windows Product Key

It's easy enough to find Windows product key with the first three steps. However, it should be the easiest method to use specialized software. iSumsoft Product Key Finder is just the most powerful product key finder software that can find lost product key for any Windows and programs installed on computer.
What you need to do is downloading and installing iSumsoft Product Key Finder on your computer, launch it, and click Start Recovery button. Then all product keys and IDs for your Windows and other software currently installed on the computer should be showed in the list. Clicking the Save to File button you can save all the product keys into a Notepad.
Tips: The above two methods to find Windows product key both work even if you can't boot your computer normally. If your computer can't boot, just need to put the hard drive into another working computer and find lost Windows product keys with any one of the above two methods.


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