A corrupted USB or DVD is the most common cause.
Faulty RAM can corrupt files during loading.
A loose USB port, or using a USB 3.0 port without proper driver support during setup, can interrupt file transfers. how to fix windows could not load required file winsetup.dll
Boot from a Linux Live USB (e.g., Ubuntu) and copy all important data off the drive before attempting a full format and clean install. If the error persists even with a new hard drive, your motherboard may have a failing controller – test with another PC.
If you see this error while trying to run a program or update inside Windows (not during installation): How do you fix missing dll files on Windows 11? A corrupted USB or DVD is the most common cause
Ensure your boot mode matches how you flashed your USB. If your USB is GPT, set boot mode to UEFI Only . If your USB is MBR, enable CSM/Legacy Support .
How to Fix "Windows Could Not Load Required File Winsetup.dll" Boot from a Linux Live USB (e
This wipes all data on the drive. Back up first if possible.