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A central hierarchical database used in Microsoft Windows 98, Windows CE, Windows NT, and Windows 2000 used to store information that is necessary to configure the system for one or more users, applications and hardware devices.

The Registry contains information that Windows continually references during operation, such as profiles for each user, the applications installed on the computer and the types of documents that each can create, property sheet settings for folders and application icons, what hardware exists on the system, and the ports that are being used.

The Registry replaces most of the text-based .ini files that are used in Windows 3.x and MS-DOS configuration files, such as the Autoexec.bat and Config.sys. Although the Registry is common to several Windows operating systems, there are some differences among them.

A registry hive is a group of keys, subkeys, and values in the registry that has a set of supporting files that contain backups of its data. The supporting files for all hives except HKEY_CURRENT_USER are in the %SystemRoot%\System32\Config folder on Windows NT 4.0, Windows 2000, Windows XP, Windows Server 2003, and Windows Vista. The supporting files for HKEY_CURRENT_USER are in the %SystemRoot%\Profiles\Username folder. The file name extensions of the files in these folders indicate the type of data that they contain. Also, the lack of an extension may sometimes indicate the type of data that they contain.


Registry hive Supporting files
HKEY_LOCAL_MACHINE\SAM Sam, Sam.log, Sam.sav
HKEY_LOCAL_MACHINE\Security Security, Security.log, Security.sav
HKEY_LOCAL_MACHINE\Software Software, Software.log, Software.sav
HKEY_LOCAL_MACHINE\System System, System.alt, System.log, System.sav
HKEY_CURRENT_CONFIG System,System.alt,System.log,System.sav,Ntuser.dat.
HKEY_USERS\DEFAULT Default, Default.log, Default.sav

This blog is for windows xp registry. if some budy play with own PC its important how to change your PC start up name and how to hide the drive and lot of things.

Read this blog Carefully.if u r interested to play with ur PC.


Defination- In the Microsoft Windows operating systems beginning with Windows 95, the registry is a single place for keeping such information as what hardware is attached, what system options have been selected, how computer memory is set up, and what application programs are to be present when the operating system is started. The registry is somewhat similar to and a replacement for the simpler INI (initialization) and configuration files used in earlier Windows (DOS-based) systems.

INI files are still supported, however, for compatibility with the 16-bit applications written for earlier systems.

In general, the user updates the registry indirectly using Control Panel tools, such as TweakUI. When you install or uninstall application programs, they also update the registry.

In a network environment, registry information can be kept on a server so that system policies for individuals and workgroups can be managed centrally.