How to Find a Product Key on a Computer
A product key is a multi-digit series of numbers and letters that is unique to your specific installation of a program or operating system. Nobody else on the planet should be using your specific key for a program, which is why the program is able to use the key to validate your installation and prove you legally purchased your software. Finding a product key on a computer will vary in procedure depending on what type of key you're trying to find.
Windows Product Key
Choose the "System Properties" option. Your Windows operating system product key will be listed at the bottom of the page that is now open onscreen.
Open the program you want to work with by clicking on its shortcut icon in this folder.
Look for one of two options in the program's "Help" menu--either "Registration" or "About." Most of the time, a program's product key will be listed under the "About" screen, but certain programs may require you to enter a dedicated "Registration" page in order to find the information.