MSConfig

MSConfig, officially called System Configuration or System Configuration Utility, is a utility used to troubleshoot the Microsoft Windows startup process by allowing the user to temporarily disable drivers, services and other applications that launch at startup, as well as changing other aspects of system configuration.

History
The utility was introduced with Windows 98, where it allowed the user to modify the configuration files of both MS-DOS and Windows, selectively disable the processing of some files at startup, as well as toggle certain troubleshooting settings. For Windows Me, the tool was updated, mostly due to the removal of most access to real mode MS-DOS.

It was ported to the NT-based series with Windows XP, which added the ability to modify the boot manager configuration, as well as to selectively disable services. The Tools page was also introduced, which serves as a hub to other included system utilities. In Windows Vista, the ability to modify the legacy  and   configuration files was removed. Windows 8 saw the last major update to the tool, as the Startup tab was deprecated in favor of managing applications that run on startup from the redesigned Task Manager.