Which Windows registry hive stores settings for the computer as a whole?

The Windows registry hive that stores settings for the computer as a whole is HKEY_LOCAL_MACHINE. This hive contains configuration information for the hardware, operating system, and software settings that are applicable to the entire computer, rather than to individual user profiles.

The HKEY_LOCAL_MACHINE hive is key for system-wide settings and is essential for the operating system's performance and security. It includes data like system drivers, hardware settings, and many application configurations that need to be consistent across all users on the machine.

In contrast, other hives like HKEY_CURRENT_USER hold settings that are specific to the current logged-in user, ensuring personalized experiences and preferences. HKEY_CLASSES_ROOT is primarily used for file association settings and COM information, while HKEY_CURRENT_CONFIGURATION deals with information relevant to the current hardware profile in use, typically only reflecting changes during system boot rather than comprehensive system-wide settings.