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It is executed in three phases for each device: critical part of initialization (while interrupts are disabled), device initialization (when file I/O is allowed) and Init Complete phase.
COM), but these two files aren't critical to the boot process, as Windows 9x IO. The ROM BIOS starts the execution at the physical memory address FFFF0h. INI file exists, it also loads drivers for compressed disks. SYS contains a default setting for both, in case they're absent in the system. During this phase, BIOS first executes Power-on self-test (POST), then checks the existence of boot disk on A drive. SYS file and displays a startup image on the screen. Windows then tries to open the registry file SYSTEM. The boot sector contains the disk boot program and BIOS Parameter Block (BPB) table which to finds the location of the root directory and IO. When a user logs on, his desktop settings are loaded from the registry, or the desktop configuration uses a default desktop.
After all the drivers are loaded, the Kernel32.dll, gdi32.dll, Gdi.exe, user32.dll, User.exe, shell32and are loaded.
After initialization of display driver, Windows switch to graphical mode.