What is regedit

Feb 25, 2009

Understanding Regedit

The Microsoft Registry Editor enables you to view, search for, and change settings in your system registry, which contains information about how your computer runs. Windows stores its configuration information in a database called the registry which can be accessed using Regedit.exe(Registry Editor). The registry contains profiles for each user of the computer and information about system hardware, installed programs, and property settings. Windows continually references this information during its operation. Although you can use Registry Editor to inspect and modify the registry, doing so is not recommended, as making incorrect changes can damage your system.

Registry Editor overview
Registry Editor is an advanced tool for viewing and changing settings in your system registry which contains information about how your computer runs. Windows stores its configuration information in a database (the registry) that is organized in a tree format.When you view the registry in the Microsoft Registry Editor its hierarchical nature becomes obvious. The editor presents an Explorer-like view of the registry, with a tree in the left pane and data in the right

Arcitecture of regedit

The registry tree is divided into six broad sections (five in NT). HKEY_CLASSES_ROOT HKEY_CURRENT_USER HKEY_LOCAL_MACHINE HKEY_USERS HKEY_CURRENT_CONFIG HKEY_DYN_DATA Folders represent keys in the registry and are shown in the navigation area on the left side of the Registry Editor window. On the left side below My Computer their are five keys HKEY_CLASSES_ROOT, HKEY_CURRENT_USER, HKEY_LOCAL_MACHINE, HKEY_USERS, HKEY_CURRENT_CONFIG, HKEY_DYN_DATA. On expanding these Keys we'll get the sub keys. In the right side area, the entries in a particular sub key are displayed, which are Name(Contains name of the value), Type(contains type of the value), and Data(Contains associated data of the value.)When you double-click a entry, it opens an editing dialog box. At the status bar of regedit path is shown.



navigating regedit

You should not edit your registry unless it is absolutely necessary. If there is an error in your registry, your computer may not function properly. If this happens, you can restore the registry to the same version you were using when you last successfully started your computer Regedit.exe is automatically installed during setup and is stored in same folder as is Windows. To start Regedit.exe

  1. Click Start, and then click Run.
  2. Type Regedit, and then click OK.

Navigation
The navigation area of the Registry Editor displays folders, each of which represents a predefined key (a key that represents one of the main division of the registry for eg: HKEY_LOCAL_MACHINE ) on the local computer. When accessing the registry of a remote computer, only two predefined keys, HKEY_USERS and HKEY_LOCAL_MACHINE, appear.

Folder/predefined keyDescription
HKEY_CURRENT_USERContains the root of the configuration information for the user who is currently logged on. The user's folders, screen colors, and Control Panel settings are stored here. This information is referred to as a user's profile.
HKEY_USERSContains the root of all user profiles on the computer. HKEY_CURRENT_USER is a subkey of HKEY_USERS.
HKEY_LOCAL_MACHINEContains configuration information particular to the computer (for any user).
HKEY_CLASSES_ROOTIs a subkey of HKEY_LOCAL_MACHINE\Software. The information stored here ensures that the correct program opens when you open a file by using Windows Explorer.
HKEY_CURRENT_CONFIGContains information about the hardware profile used by the local computer at system startup.

The following table lists the data types currently defined and used by the system.

Data typeDescription
REG_BINARYRaw binary data. Most hardware component information is stored as binary data and is displayed in Registry Editor in hexadecimal format.
REG_DWORDData represented by a number that is 4 bytes long. Many parameters for device drivers and services are this type and are displayed in Registry Editor in binary, hexadecimal, or decimal format.
REG_EXPAND_SZA variable-length data string. This data type includes variables that are resolved when a program or service uses the data.
REG_MULTI_SZA multiple string. Values that contain lists or multiple values in a form that people can read are usually this type. Entries are separated by spaces, commas, or other marks.
REG_SZA fixed-length text string.
REG_FULL_RESOURCE_DESCRIPTORA series of nested arrays designed to store a resource list for a hardware component or driver.

Add a key

Caution

  • Incorrectly editing the registry may severely damage your system. Before making changes to the registry, you should back up any valued data on your computer.
  • You must back up your registry before tweaking into it or it may lead you to reinstall your operating system.
  • You can search for lot of registry backup tool an use any one of them, like ERUNT or click here for alternate methods of backing up registry.

Referrences

  • Microsoft Help and Support center.
  • PC SUPPORT ADVISOR
  • picture - http://www.nogeekleftbehind.com/images/regedit_dell_wallpaper.jpg
  • piture -http://www.photocamel.com/gallery/data/540/regedit.JPG

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