If you have problem with Windows and you need to enter Safe Mode to fix the problem, you can press F8 to boot into Safe Mode on the earlier version of Windows (Windows XP, Windows Vista, and Windows 7). But you can’t enter Safe Mode on Windows 8/8.1 with that method any more. So, I summarized 3 different ways to boot into Safe Mode on Windows 8/8.1 which are as following:
3 different ways to boot into Safe Mode on Windows 8/8.1
Press Shift + F8 before Windows logo appears (after finishes BIOS)
This is the easiest way to enter Safe Mode, but it may not work with a fast computer, or if you use UEFI, because its startup time is very fast so it’s almost impossible to press the key in time.
If you manage to enter recovery mode, click See advanced repair options.
Select Advanced options.
Select Startup Settings.
Click Restart to reboot your computer.
On Startup Settings, you can choose to boot into Safe Mode by press F4, F5, or F6 and you then will boot into Safe Mode.
After you finishes in Safe Mode, you can restart your system as usual and Windows
will boot into normal mode.