Windows supports several Safe Boot options that load a
minimal set of drivers. You can use these options to start Windows so that you
can modify the registry or load or remove drivers.
To use a Safe Boot option, follow these steps:
- Restart your computer, and when the Boot menu appears,
- When the Windows Advanced Options menu
appears, select an option, and then press ENTER.
- When the Boot menu appears again, with the words "Safe
Mode" displayed in red at the bottom, select the installation you want to
start, and then press ENTER.
: Do not select a Microsoft Windows NT 4.0 installation.
Description of Safe Boot Options
- Safe Mode (Safeboot_Option=Minimal): A minimal set of
device drivers and services to start Windows.
- Safe Mode with Networking (Safeboot_Option=Network): A
minimal set of device drivers and services to start Windows plus the drivers
necessary to load networking.
- Safe Mode with Command Prompt (Safeboot_Option=Minimal):
This is the same as Safe mode, with the exception that Cmd.exe is started
rather than Windows Explorer.
- Enable VGA Mode: This starts Windows in 640 X 480 mode
using the current video driver (not Vga.sys). This mode is useful for cases in
which the display was configured at a setting the monitor cannot
NOTE: Safe mode and Safe mode with Networking load the Vga.sys driver
- Last Known Good Configuration: This starts Windows using a
previous good configuration.
- Directory Service Restore Mode: This mode is valid only for
Windows domain controllers. It performs a directory service repair.
- Debug Mode: This option enables debug mode in Windows.
Debugging information can be sent across a serial cable to another computer
running a debugger. This mode is configured to use COM2.
- Enable Boot Logging: When the computer is started with any
of the Safe Boot options except Last Known Good Configuration, logging is
enabled. The Boot Logging text is recorded in the Ntbtlog.txt file in the
An environment variable is set when you use one of the Safe
Boot options. The environment variable is "Safeboot_Option." This variable is
set to either Network or Minimal.
The default Microsoft VGA driver
is used for display (640 X 480 X 16 colors). You must log on in all modes
(either by a domain or the local SAM, depending on which Safe Boot mode you