Will windows 7 automatically replace windows 10 if I install them from a bootable usb?

Yes, unless you install 7 onto a separate disk partition. (look up how to partition disk). My question though is why would you go back to 7 when you have 10? I like 7 myself but 10 fixed all the problems with 8 and is like 7.

No, Windows 7 will not automatically replace Windows 10 if you install them from a bootable USB. The process of installing a new operating system involves several steps and it is up to the user to choose which operating system to install and which one to keep.

When you boot from a USB and initiate the installation process, you will be prompted to select the partition where you want to install the new operating system. By default, Windows will show you the available partitions on your hard drive and you can choose the one where Windows 10 is currently installed. This will result in a complete reinstallation of Windows 10, effectively replacing your current version.

However, if you have multiple partitions on your hard drive, you can choose to install Windows 7 on a different partition, coexisting with Windows 10. In such a scenario, you will have both operating systems installed on your computer, and you can choose which one to boot into when you turn on your computer.

It is important to note that the installation process for Windows 7 will also give you the option to delete or format your current Windows 10 partition. If you do not wish to keep Windows 10 and want to completely replace it with Windows 7, you can choose to delete or format the partition during the installation process.

In case you accidentally delete or format your Windows 10 partition, it is important to have a backup of your important files and data. Deleting or formatting a partition will result in the loss of all data stored on that partition.

Additionally, before proceeding with the installation of Windows 7, make sure to check the compatibility of your computer's hardware and software with Windows 7. If your computer is currently running Windows 10, it is likely that it meets the system requirements for Windows 7 as well. However, it is always a good idea to double-check to avoid any potential issues during and after the installation process.

In summary, if you choose to install Windows 7 from a bootable USB, it will not automatically replace Windows 10. You can either choose to install it on the same partition as Windows 10, resulting in its replacement, or on a different partition, allowing for coexistence of both operating systems. It is important to carefully read and follow the prompts during the installation process to avoid any accidental data loss or other issues.