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How do I install an operating system on a brand new computer?
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Install an Operating System on a Brand New Computer
1. Create a new Windows Installation Media from the tool at https://www.microsoft.com/en-us/software-download/windows10.
2. Insert the USB Windows installation media and boot up your PC.
3. Press the stated button combination on-screen to boot into the BIOS or Boot menu.
4. Use the Boot order option or Boot menu to boot from the USB drive.
5. Select your language, country, and keyboard input and click Next.  
6. Click Install Now.
7. Enter your Windows product key and click Next.
8. Select your Windows Edition and click Next.
9. Agree to the license terms and click Next.
10. Select "Custom Install" and click Next.
11. Select a drive with unallocated space and click Next.
12. Remove the USB drive when Windows is finished installing.
13. Reboot your PC and follow the instructions to complete the setup process.