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2 Responses to “How do i recover my lost registry key in my previous lost windows XP ?”

1. Zeetips, on March 21st, 2010 at 5:10 am Said:

   The first step is getting the ntuser.dat file from the computer. In most cases the easiest method is to remove the hard drive, and connect it to a working machine.

   In your case use the old ntuser.dat file

   ntuser.dat is generally located here:
   C:\Documents and Settings\(User Name)\ntuser.dat
   Where (User Name) is the primary account – Most often it is ‘Owner’ or ‘User’

   Now that you have the file, you need to be able to view it. I recommend loadhive.exe (http://www.dagondesign.com/files/loadhive.exe) from matcode.com.

   Just run the program and select the file. It will show you a message with more information. It is important that you do not close this program until you are finished viewing the registry, as it temporarily loads the file, and unloads it again when you exit.

   Now run regedit. Under HKEY_LOCAL_MACHINE you will notice a new sub-key called NTUSER. Starting with NTUSER go to Software > Microsoft > Windows NT > Current Version.

   In the right window, double-click on DigitalProductID. This is the entry that contains the encoded product key.

   We want the information in bytes 52 to 66. You can use the chart below for reference. We need the 15 sets of numbers where the 1’s are located.

   0000 00 00 00 00 00 00 00 00 ..
   0008 00 00 00 00 00 00 00 00 ..
   0010 00 00 00 00 00 00 00 00 ..
   0018 00 00 00 00 00 00 00 00 ..
   0020 00 00 00 00 00 00 00 00 ..
   0028 00 00 00 00 00 00 00 00 ..
   0030 00 00 00 00 11 11 11 11 ..
   0038 11 11 11 11 11 11 11 11 ..
   0040 11 11 11 00 00 00 00 00 ..
   0048 00 00 00 00 00 00 00 00 ..
   0050 00 00 00 00 00 00 00 00 ..

   Now that you have the 15 byte encrypted code, you can type it into my decrypter tool:

   Web-based version

   Windows XP Key Decrypter Tool
   ( http://www.dagondesign.com/tools/windows-xp-key-decrypter/)

   Just click ‘Decrypt Code‘ and you will have your 25 digit Windows XP product key!

   Troubleshooting

   If you cannot find the DigitalProductId key in the file you loaded earlier, try the software hive located here:

   \%SystemRoot%\System32\config\software

   Load it the same way as before. Under regedit, it will generally create the new entries here: HKEY_LOCAL_MACHINE\SOFTWARE_00 (although the loadhive program will tell you where it puts it).
   References :
   http://www.blog.manups.co.cc/2009/08/produkey-v135-recover-lost-windows.html

2. Ira Pautova, on March 21st, 2010 at 5:19 am Said:

   Try Recover Keys. It retrieve your lost software activation codes, product ID, show Auth. key, company and user name. It will recover your lost license keys for Windows, Ms Office, Adobe products and a lot of other popular software products.
   To recover your programs activation keys with Recover Keys these programs must be installed on your PC and system must RUN. If you want to recover CD keys after formatting your hard disk RK will not help you.
   Recover Keys works on Windows NT / 2000 / XP / Vista / Windows 7 and above.
   On first URL is a full list of supported software by Recover Keys.
   On second you can find video "How to recover lost software license key?"
   References :
   http://recover-keys.com/supported_software.php
   http://recover-keys.com/how_to_recover_lost_microsoft_windows_key.php

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