Restart Your PC: Save any open files and click on the Start menu in Windows. Select the Power option and then choose Restart.Access BIOS: As your computer restarts, watch for a message on the screen that says something like Press [key] to enter setup or Press [key] for BIOS settings. The key to press varies depending on your computer's manufacturer, but it is typically one of the following: F2, F10, Del, or Esc. Press the indicated key before Windows starts loading to enter BIOS.Navigate to Boot Options: Once you are in the BIOS, you will see a menu with different options. Look for a menu option that is related to Boot or Boot Order. The exact name and location of this option may vary depending on your BIOS version and manufacturer. Use the arrow keys on your keyboard to navigate to this menu option and press Enter to select it.Change Boot Order: In the Boot or Boot Order menu, you will see a list of devices that your computer can boot from, such as the hard drive, CD/DVD drive, USB drive, etc. Use the arrow keys to select the device you want to boot from first. To change the boot order, you will typically need to use the + (plus) and - (minus) keys or a specific key (such as F6 or F5) to move the selected device to the top of the boot order list. This will set the selected device as the first boot option.Save Changes and Exit: Once you have set the desired boot order, look for an option in the BIOS menu to save your changes. This option may be labeled as Save Changes and Exit or something similar. Select this option and then choose Yes or Save Changes and Exit to save the changes and exit BIOS.Restart Your PC: Your PC will now restart with the new boot order settings. If you have set it to boot from a different device (e.g., a USB drive), make sure that device is connected and contains a bootable operating system.