Have a windows installation disk but don't know it's serial key...?? Don't worry, the installation disk itself is going to tell you its serial key. You can easily find the serial key of your windows operating system using this trick. Follow the instructions below:

For Windows XP:

• If you have a running pc, put the windows installation disk in the optical drive.
• Explore the disk and go to I386 folder.
• Now search for the file named UNATTEND and open this file in notepad.
• At the end of the text, you will find the serial key.

For Windows 7:

• If you have a running pc, put the windows installation disk in the optical drive.
• Explore the disk and go to SOURCES folder.
• Now search for the file named PRODUCT and open this file in notepad.
• Now you will find the serial keys for all versions of windows 7.

Enjoy.