Starting Windows 10 in Safe Mode

Good evening

It is entirely possible

There are several ways to start it in safe mode, see here: https://www.commentcamarche.net/informatique/windows/113-demarrer-windows-10-en-mode-sans-echec/

If you still have control of your system: Start your machine. Hold down the "SHIFT" key located on the left side of the keyboard and click the "Shut down" option followed by "Restart".

If you no longer have control of your computer: Turn it off. Wait a few seconds. Turn it on while pressing "SHIFT + F8" several times.
If you're lucky, a blue screen will appear, with five different buttons.

The first will allow you to exit the assistant as if nothing happened, and to start your Windows 8, Windows 8.1, or Windows 10.

The second goes a bit further as it will help you repair your computer using a connected USB device or even a reinstall CD/DVD. If your PC is completely crashed and you want to reset it, this is the option you need.
There is another method that is a bit more complicated, but trying this method may not work for all PCs apparently.

Good luck

Avoid installing those free software that supposedly boost or repair your PC as they have no major usefulness. The best tools in Windows are called Dos....&.. Powershell..
Always keeping an eye on you