Safe mode

Safe mode is a recovery feature of Microsoft Windows which allows to start the operating system in a light-weight configuration. It enables only the most essential services and drivers, whose list is stored in the registry, and forces the default basic video driver, which makes it useful for troubleshooting driver and configuration issues. The main difference between Windows Recovery Environment and safe mode is that while the recovery environment is a Windows PE distribution stored on a separate partition and is accessible as long as the boot manager is functional, safe mode operates on the main Windows installation and requires the core system components to be intact and functional. It was introduced in Windows 95, but was not included in NT-based versions. Instead, NT included an option to use the "last known good configuration" to boot the system, up until Windows 2000.

It evolved from a similar feature in MS-DOS 6, which allowed the user to press the F8 key during boot to enter an interactive startup mode, where the operating system would print out each statement in  and   and ask whether should it be executed, or the F5 key to skip parsing of the configuration files completely.

In Windows 10, safe mode includes the following configurations:
 * Safe Mode, which loads only services and drivers whitelisted in.
 * Safe Mode with Networking, which loads only services and drivers whitelisted in.
 * Safe Mode with Command Prompt, which is the same as regular Safe Mode, but runs the executable specified in the  string value in   (set to   by default, hence the name) instead of the regular shell.

Upon booting a system in safe mode and logging in, the system displays a notice about its purpose. Safe mode also sets the desktop background to a solid black color and displays a distinctive watermark that includes the words "Safe Mode" in each corner and the operating system version at the top center. This overrides other forms of watermark, if any. In Windows 9x, safe mode doesn't change the desktop background nor display the system version on the desktop, though it still shows the label "Safe mode" in each corner of the desktop and displays a notice after boot up.