To restart your Windows in Safe Mode, follow these steps:

1. Click the Windows Start icon, select the Power icon, then hold down the Shift ⇧ key on your keyboard and select Restart.
2. When the Choose an option screen appears, select Troubleshoot.
3. Select Advanced options.
4. Select Startup Settings.
5. Click Restart to open a list of Startup Settings options.
6. Select option 4) Enable Safe Mode.
   For certain troubleshooting tasks, you can alternatively select option 5) Enable Safe Mode with Networking or option 6) Enable Safe Mode with Command Prompt.
7. Click the Windows Start icon, select the Power icon, then hold down the Shift ⇧ key on your keyboard and select Restart.
8. When the Choose an option screen appears, select Troubleshoot.
9. Select Advanced options.
10. Select Startup Settings.
11. Click Restart to open a list of Startup Settings options.
12. Select option 4) Enable Safe Mode.
    For certain troubleshooting tasks, you can alternatively select option 5) Enable Safe Mode with Networking or option 6) Enable Safe Mode with Command Prompt.
13. On your keyboard, press the Windows logo key and X key simultaneously.
14. Select Shut down or sign out, then hold down the Shift ⇧ key on your keyboard and select Restart.
15. When the Choose an option screen appears, select Troubleshoot.
16. Select Advanced options.
17. Select Startup Settings.
18. Click Restart to open a list of Startup Settings options.
19. Select option 4) Enable Safe Mode.
    For certain troubleshooting tasks, you can alternatively select option 5) Enable Safe Mode with Networking or option 6) Enable Safe Mode with Command Prompt.
20. Click the Windows Start icon and click the arrow icon beside Shut down. Then, while holding down the F8 key on your keyboard, select Restart.
21. Continue to hold down the F8 key until your PC restarts and a list of options appears.
22. Use the arrow keys on your keyboard to highlight the Safe Mode option, and press Enter.
    For certain troubleshooting tasks, you can alternatively select Safe Mode with Networking or Safe Mode with Command Prompt.

When your PC restarts, Windows is in Safe Mode and ready for you to perform troubleshooting tasks.