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# Your PC must have at least 16 GB (for 32-bit) and 20 GB (for 64-bit) of free space on your Windows 7 drive (the drive where Windows 7 is currently installed). # Your Windows 7 PC must be bootable and your PC must have an optical drive (DVD drive).
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# This guide is helpful for those who have a Windows 7 DVD but not the product key. Things you need to know before beginning to reinstall Windows 7 using this method
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Note that you must use Windows 7 installation DVD as a bootable media as a bootable Windows 7 USB doesn’t help in this method. In other words, if your Windows 7 PC is working and bootable, you can re-install Windows 7 without a product key without the help of third-party tools provided that you have a Windows 7 installation DVD. The beauty of Windows 7 and one of the hidden features of Windows 7 is that this version of Windows can be re-installed on the same PC without having to enter the product key, legally.
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