To create a dual boot system for Windows 10 and Windows 7 on a desktop computer while continuing to use legacy software, follow these steps:
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Backup Data Before making any changes to your system, it's essential to back up all important data to an external hard drive or cloud storage service.
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Create Windows 7 Installation Media Download the Windows 7 ISO file from a trusted source, create a bootable USB drive using a tool like Rufus, and boot your computer from the USB drive.
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Partition Disk During the Windows 7 installation process, you'll be given the option to partition your disk. You'll need to create two partitions: one for Windows 7 and another for Windows 10. Make sure the Windows 7 partition is larger than the minimum required for your operating system.
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Install Windows 7 Complete the Windows 7 installation process on the newly created partition.
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Install Windows 10 Restart your computer and boot from your Windows 10 installation media. During the installation process, choose the unallocated space (the one you created for Windows 10) as the installation location.
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Install Legacy Software After both operating systems are installed, you can install your legacy software on either or both systems, depending on compatibility.
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Configure Boot Manager The boot manager will automatically be installed during the Windows 10 installation. You can adjust the boot order in the UEFI settings of your computer to choose which operating system starts upon boot.
For more detailed information, refer to these resources: