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HKEY_CLASSES_ROOT or HKCR – This key is for all your windows shortcuts and the core aspects of the Windows user interface.

All users on a given computer who log on the system use this information.

HKEY_LOCAL_MACHINE or HKLM – This key contains specific information about the type of the software, hardware and other preferences for your computer.

The most frequently used registry keys you can see when you open the Windows Registry Editor are:

However, some changes may expose the whole system at stake and result in system disruption. The changes may have low-impact on the system like changed appearance of the desktop wallpaper, screensaver and added buttons in the drop-down menus. Generally once activated on the computer unwanted software or malware modify the entries in the Windows Registry Editor. The Registry keys are container objects similar to folders while the values are non-container objects similar to files. The Windows Registry has two essential elements called “keys” and “values”. The subkey contains information about program’s version, its location, and settings how to start the program. Whenever a new program is installed, a new subkey is added to the Windows Registry.

The Windows Registry is a hierarchically structured database that stores low-level settings for Microsoft Windows OS and for applications that utilize the Registry in order to work properly.