Boot screen

A boot screen is often displayed by an operating system or other software to visually indicate its initial loading process. Depending on the software, the screen can include version information, branding, a definite or indefinite progress bar, or a startup log.

Windows 1.0 and 2.x
The boot screen was first introduced in Windows 1.0 Beta Release. In Windows 1.04, the boot screen was updated with a new logo, which was used by Microsoft until 2012.