Booting or startup process of computers?

he sequence of booting Windows Xp is slightly different from any previous version of Windows that uses the NT kernel. First, when the computer is switched on, either the BIOS or the EFI is loaded. In the case of a BIOS system, the MBR of the boot disk, which can be a hard drive or external media, is accessed, followed by the boot sector of the drive or of relevant hard disk partition. This boot sector then loads the rest of the boot blocks. For Windows Vista, the boot sector loads the Windows Boot Manager (Filename:Bootmgr.) which accesses the Boot Configuration Data store and uses the information to load the final stage, the Operating System.