Windows and Linux are dual systems that are booted with grub. So, if you need to make Windows the default startup, you need to modify the Grub configuration file under Linux. In Red Enterprise Linux as a column.
Vim/boot/grub/grub.conf
Notice that there are several lines in the file that begin with title. Oh, whether you find that Windows is also in one of the line.
From top to bottom, count your windows in the first few title.
As pictured above, my Windows7 is the second title line. OK, look at the default=1 on the top of the chart.
Defualt name Incredible. The default meaning, yes. This is where you set the first few title actions to start by default. Just write a number on the line.
The grub count, however, starts at 0. So the number to write here is the n-1 of your title line. Other words. I am the second title. But I'm going to write 2-1=1. So. The defult=1 of my system is actually started with Windows7 as the default.
Landlord please calculate according to the different situation of your system should default= how much. The above is the Rhel grub modification method. Other Linux distributions will have a few differences. In short, the method is the same as the solution idea.