How To Find The Product Key Of Windows Xp In Registry?

Firstly we need to download a software called "xpkeyDecrypt" its a freeware,Then

Start->Run->Regedit->Hkey_Local_Machine\Software\Microsoft\WindowsNT\CurrentVersion

at right side you will find DigitalProductid Double Click on that we can see there are lot of junk characters. Actually windows will encrypt the product key

Value added

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

From the above table Product key is stored in the form of 1's ie from 52 to 66 bytes,Total 15 bytes of encrypted code.

Open xpkeydecrypttool on the above textbox enter the encrypted code without space,after entering just click on decrypt tool u can see ur product id.

This also applies to Windows Vista

you need to download a software called "xpkeyDecrypt" its freeware Which Decrypt the product key in the form of user readable format