How to Start Up in Safe Mode in Windows 7by Margaret Worthington ; Updated September 28, 2017
When your computer stops working properly or has encountered an error that you can't seem to fix when you boot it up normally, booting into Safe Mode is one of the ways to start to solve the issue. Safe Mode starts your Windows 7 computer with only the most necessary drivers and services so that you can troubleshoot hardware and software issues in a safer environment.
Turn on your computer or restart your computer if it is already on.
Press the F8 key and hold it until the "Advanced Boot Options" screen appears.
Use your down and up arrow keys to highlight the "Safe Mode" boot option.
Press "Enter" to boot into safe mode.