The book is devoted to the internal device and algorithms of the main components of the Microsoft Windows operating system - Windows Server 2003, Windows XP and Windows 2000 - and the NTFS file system . System mechanisms are considered in detail: dispatching of traps and interruptions, DPC, ADR, LPC, RPC, synchronization, system workflows, global flags, etc. Also describes all the stages of booting the operating system and completing its work. In the fourth edition of the book, more attention is paid to in-depth analysis and elimination of problems due to which the operating system collapses or because of which it cannot be downloaded. In addition, the details of the implementation of support for hardware platforms AMD x64 and Intel IA64 . are considered. The book consists of 14 chapters, a dictionary of terms and a subject index. The book is intended for system administrators, developers of serious applications and anyone who wants to understand how the Windows operating system works. The names of all commands, dialog boxes and other interface elements of the operating system are given in both English and Russian.