As I suggested above.
Boot from the installation media.
To do so requires a shutdown or restart and then using the correct keyboard input to produce a one time boot menu screen that will allow the computer to boot to a specific device of your choosing.
Another less elegant option of getting into the Windows RE advanced trouble shooting options to boot into safe mode, is …..
After holding down the power button until all lights and fans are off then use the same power button to turn it back on and when you see the circling dots turn it off again using the power button.
It may take more than one try, sometimes as many as three, but.....
At some point you will see "attempting automatic repair" text at the bottom of the screen. From there you should be offered your troubleshooting options, and from there you should see Startup settings, which should allow you to boot the system into safe mode.