Start SAFE MODE if Windows 7,8,10 didn't start

Boot from any boot USB and open command prompt

If this SCCM USB flash memory when you will see password windows request type F8 to open command line

After the command system prompt, enter the command for the safe mode option you want. Enter the information exactly.

Enable Safe Mode - Type:

bcdedit /set {default} safeboot minimal and press Enter.

Enable Safe Mode with Networking - Type:

bcdedit /set {default} safeboot network and press Enter.

Enable Safe Mode with Command Prompt - Type:

bcdedit /set {default} safeboot minimal and press Enter:

bcdedit /set {default} safebootalternateshell yes and press Enter.

The computer responds with the operation completed successfully when you have entered the command correctly.

Notice: This changing is permanent so for EXIT from safemode

Type the following command to exit Safe Mode:

bcdedit /deletevalue {default} safeboot and press Enter.

If Windows can start when you restart computer hold “Shift” key and after we can see start up option for troubleshooting (on Windows XP same as Windows 7 this is F8 when computer started).