Safe Mode could be a troubleshooting possibility that limits Windows OS to basic functions. Safe Mode starts Windows with solely basic drivers and services. Safe Mode with Networking starts windows with only basic drivers, and net support. to start your computer in Safe Mode or Safe Mode with Networking, follow the directions below:
Boot Windows 7 in Safe Mode.
To boot into Safe Mode, first shut down your computer. Locate the F8 key on keyboard; turn the PC on; and as soon as you see anything on the screen, press the F8 key repeatedly. This should bring up the Advanced Boot Options menu; there, select Safe Mode with Networking and press Enter.
startup options:
· Safe Mode with Networking. Starts Windows in safe mode and includes the network drivers and services needed to access the Internet or other computers on your network.
· Safe Mode with Command Prompt. Starts Windows in safe mode with a command prompt window instead of the usual Windows interface. This option is intended for IT professionals and administrators.
· Enable Boot Logging. Creates a file, ntbtlog.txt, that lists all the drivers that are installed during startup and that might be useful for advanced troubleshooting.
· Enable low-resolution video (640×480). Starts Windows using your current video driver and using low resolution and refresh rate settings. You can use this mode to reset your display settings. For more information, see Change your screen resolution.
· Last Known Good Configuration (advanced). Starts Windows with the last registry and driver configuration that worked successfully.
· Directory Services Restore Mode. Starts Windows domain controller running Active Directory so that the directory service can be restored. This option is intended for IT professionals and administrators.
· Debugging Mode. Starts Windows in an advanced troubleshooting mode intended for IT professionals and system administrators.
· Disable automatic restart on system failure. Prevents Windows from automatically restarting if an error causes Windows to fail. Choose this option only if Windows is stuck in a loop where Windows fails, attempts to restart, and fails again repeatedly.
· Disable Driver Signature Enforcement. Allows drivers containing improper signatures to be installed.
· Start Windows Normally. Starts Windows in its normal mode.
Booting Into Safe Mode on Windows 8 / 8.1
1. press the Windows key 
+ C, and then click Settings.
2. Click Power, hold down Shift on your keyboard and then click Restart.
3. You will need to click on the Troubleshoot button.
4. Now select Advanced Options.
5. Now choose the Windows Startup Settings option, by the looks of things we were never meant to find Safe Mode.
6. Finally hit the Restart button.
7. when your PC reboots, Press 5 on your keyboard to Enable Safe Mode with Networking. Windows will start in Safe Mode with Networking.
Start Windows 10 in Safe Mode with networking
1. Click Start → Power and then hold the Shift key on your keyboard and click Restart.
2. Click Troubleshoot.
3. Click Advanced options.
Step 4. Click Startup Settings.
Step 5. Click on restart
6. After your computer restarts, press 5 on your keyboard to select Safe Mode with Networking.
Svanews 