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Hi John,
If your PC meets the hardware requirements for Windows 11, you can cleanly install Windows 11 using the Windows 11 USB setup disk. Please check out the Windows 11 system requirements at the following link:
Windows 11 Specs and System Requirements | Microsoft Windows
The video tutorial below should help you cleanly install Windows 11.
However, note that Windows 11 is a client Operating System; it can't be used as a full-fledged server. But you can use it for file and printer sharing, media sharing, etc. The Windows EULA explicitly allows you to permit up to 20 other devices to connect to the licensed machine at the same time to use core file services and print services for personal or internal purposes.
The following article explains how to set up your Windows 11 PC as a NAS server.
How to convert a PC into a NAS on Windows 11 | Windows Central
Standard Disclaimer: There is a link to a non-Microsoft website. The page appears to provide accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as PUPs (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.