However, you will need the key that came with your copy of the Windows 7 operating system before you can reinstall it.
Please note, however, that the Windows 7 serial key is encrypted in the Windows Registry, making it nearly impossible to find manually. Luckily, there is a way to decode and display the key.
The easiest way to find your Windows 7 serial key is to download a free key finder program. Product key finder programs automatically search your computer for your Windows 7 serial key.
Important: Keep in mind that your valid and legal Windows 7 serial key will only be found if you run it on a computer with your copy of Windows 7 still installed.
If you need specific instructions on finding your Windows 7 serial key with a product key finder, see my How To Find the Windows 7 Product Key Code guide.
These key finder programs are perfect for finding lost serial keys for operating systems like Windows 7. Many of them will also find serial keys for other operating systems, programs, and even games.
If you still can't find your Windows 7 serial key, you may, unfortunately, need to purchase a brand new copy of Windows 7 all over again.