If you're preparing to reinstall a program or an operating system (like a clean install of Windows), you will need to find your unique product key (CD key) or serial number.
Normally this product key is located with the original CD or DVD or in your order confirmation email. If you've lost your product key you can often find it in the Windows Registry but this can be difficult, sometimes even impossible, to do. Luckily, there are many free key finder programs available to help.
Below are the top 22 free key finder programs. I also keep a list of commercial key finder programs but I highly recommend that you exhaust the options below before paying for one.
2. Magical Jelly Bean Keyfinder
3. Winkeyfinder
6. ProduKey
8. Windows Product Key Finder Pro
9. WinGuggle
10. SIW (System Information for Windows) Portable
11. RockXP
13. Product Key Finder (OTT Solutions)
14. MSKeyViewer Plus
15. Free PC Audit
16. Lazesoft Windows Key Finder
19. Windows Product Key Viewer
20. Windows Product Key Finder
If your system was purchased with Microsoft Windows pre-installed and you have not reinstalled it or upgraded it yourself, a key finder may only find the generic product key that your PC manufacturer used to install Windows.
This product key may not work when attempting to reinstall Windows. In this case, you must use the unique product key that is on the sticker attached to your computer case.
If you can't locate your product key sticker you'll need to request a new Windows product key.
Read All : 22 free key finder programs
Digital Trends : The best product key finders :
If you'd like to try to record more product keys then TechRadar
recommend either SIW (System Information for Windows) Portable
or Belarc Advisor. Both are superb system information tools which can also record quite a few software licence details : they're powerful, yet easy to use.