The "Safe Mode" is a feature found in Windows 95/98/Me/2000/XP/Vista that allows you to disable unnecessary programs on your computer and load only the basic drivers, allowing you to identify the cause of a problem. Safe mode is used to solve various troubles that occur when Windows starts or to enable the removal of various threats (viruses, worms, Trojans, etc.). Before a full scan of your PC with antivirus software is better to boot Windows in Safe Mode.

Below are the steps to start the various versions of Windows in Safe Mode:

1. If your computer is running, start it again.
2. Begins to repeatedly press the F8 key on your keyboard: you will see the Windows Advanced Options Menu. If you start too early to press the F8 key on some computers may receive the message Error keyboard, in this case, reboot and try again.
3. Ensure that the Safe Mode option is selected and press Enter. The computer will boot in Safe Mode.
4. When you have finished working in Safe Mode, close all programs and restart your computer normally.

Or you can use the System Configuration Utility:
1. Close all programs.

2. Click on Start > Run then type MSCONFIG in Open and press OK.

3. System Configuration Utility, on the BOOT.INI tab, check the box/SAFEBOOT, press OK and restart the computer when prompted. The computer will restart in Safe Mode.
4. When you have finished working in Safe Mode, run MSCONFIG again and uncheck the box / SAFEBOOT BOOT.INI tab, press OK and restart your computer.