In earlier versions of Windows, boot.ini was a system file that contained information about the Windows operating systems installed on the computer. This information was displayed during the startup process when you turned on your computer. It was most useful in multiboot configurations, or for advanced users or administrators who needed to customize how Windows started.
In this version of Windows, the boot.ini file has been replaced with Boot Configuration Data (BCD). This file is more versatile than boot.ini, and it can apply to computer platforms that use means other than basic input/output system (BIOS) to start the computer.
If you need to make changes to BCD, such as removing entries from the list of displayed operating systems, use the command line tool Bcdedit, an advanced tool intended for administrators and IT professionals. For technical information about Bcdedit, go to the Microsoft website for IT professionals.
If your computer is a multiboot configuration, you can still change which Windows operating system opens by default, and how long to display the list of operating systems, by using System in Control Panel.
Open System by clicking the Start button , clicking Control Panel, clicking System and Maintenance, and then clicking System.
In the left pane, click Advanced system settings.
If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
Click the Advanced tab, and then, under Startup and Recovery, click Settings.
Under System startup, choose a default operating system and the amount of time to display the list of operating systems, and then click OK.