When you first bought your Windows OS that comes in DVD, the product key that is used to activate the installation usually engraved at the back of the DVD cover. As time goes by, your PC may become sluggish and you decide having a fresh start by reinstalling your Windows OS is the way to go. You start finding Windows DVD cover but to no avail. As we already know, the product key is essential in completing the installation otherwise you may need to buy Windows OS again which is totally ridiculous.
Windows Product Key Finder or also known as WPKF is a handy freeware from Microsoft CodePlex that can easily find your windows key and serial number. The best thing about Windows Product Key Finder is that it is a standalone program, so no installation needed on your PC, just double click on the program and click on “Find Key” to find your windows key and serial number.
Windows Product Key Finder works on Windows XP, Vista and Windows 7.