Serial numbers (a.k.a. key codes, product keys, installation keys, serials, etc.) are needed before you can install almost any popular software program. Serials and key codes are often required during installation or after using a program for a certain period of time.
If you've lost your serial number or product key code, there is a really easy way to find it if the program is still installed. You might even be able to find a program's serial number if you've uninstalled the software but only if the serial number information was left in the Windows Registry during the uninstall process.
Product key finder programs are software tools that automatically search your computer for the serials and keys stored in the registry. When you installed your operating system and other software, the serial numbers and product keys used during their installations were stored inside the registry.
You could look in the registry for the serials and keys yourself but they can be very hard to find and are often encrypted.
Most product key finder programs were originally designed to find the serial numbers and key codes for operating systems like Windows 7, Windows Vista, or Windows XP but many of them find serials and keys for many other programs too.
Important: In your search for help with serials and key codes, you've probably come across software cracking tools, keygen programs or maybe even lists of key codes free for the taking. It's very important to realize that none of those resources are legal ways of obtaining serial numbers, key codes, product keys, or any other unique code designed to protect programs from being pirated. The only legal way of installing software is by using a valid serial number or key code obtained through a legal purchase of the software program.