How to Delete Two Operating System Choices on Startup. Upon booting up, Windows may offer you multiple operating systems from which to choose.

To fix startup problems with the Windows Startup Repair tool, restart your computer, click on Troubleshoot, then Advanced Options, and select Startup Repair.

If Dual boot menu or Choose an operating system screen is missing or not showing on a dual-boot Windows 11/10, then restore it & set a default OS by using this tip.