Legacy vs UEFI - system firmware comparison
Legacy vs UEFI - system firmware comparison
Choose the appropriate boot option carefully. Since you're using Legacy mode, stick with it unless you're certain about upgrading to UEFI. Reinstalling from a clean install might be better if you want a fresh setup.
I'm talking about the boot process from the OS perspective, specifically the BIOS settings.
OS starts from the storage drive. The method doesn't need to be UEFI or old system; UEFI works better. It's also compatible with modern Windows versions.