Answer:
Boot to safe mode
Step-by-step explanation:
When a virus attacks boot system, that is to say, Windows program won´t load. The following steps should be considered taking into account what Windows Version is being used, Windows 7, 8 or 10:
1. Press F8 (Windows 7) F4 (Windows 8, 10)
2. Enable Safe Mode
3. Run Safe Mode
4. Once in safe mode the user will have access to Windows and eventually document files can be extracted via pendrive.