Windows XP and Vista Product Key Recovery

Run regedit. Under HKEY_LOCAL_MACHINE > 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 without spaces:

Web-based version
Windows XP/Vista Key Decrypter Tool

Download stand-alone version (exe)
Windows XP/Vista Key Decrypter Tool

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