Since the dawn of the Windows era, Safe Mode has been the ultimate troubleshooting tool. If you install a faulty program or device driver that causes your system to crash at startup, for example, Safe Mode is the fastest, easiest way to recover.
In the good old days, you got to Safe Mode by pressing the F8 key at just the right time in the startup sequence. On modern PCs that can start up in seconds, that option is no longer relevant.
Instead, you have to start the Windows Recovery Environment (Windows RE) and then skip past other troubleshooting tools to get to the advanced startup settings shown here.
If that option isn't available, don't worry. After two consecutive failed starts, Windows 10 automatically kicks into Automatic Repair mode. Click Advanced Options to start Windows RE. From the next few screens, click Troubleshoot, then click Advanced Options, and finally click Startup Settings. Restart to get to a plain text menu that includes a long list of advanced troubleshooting options, including three Safe Mode variations.
Aside from the blue background, the resulting menu should look familiar. Press a number to go into that option. From Safe Mode, you can uninstall the faulty program or remove the driver that's causing problems.