Safe mode is a troubleshooting option for Windows that starts your computer in a limited state. Only the basic files and drivers necessary to run Windows are started. The words Safe Mode appear in the corners of your monitor to identify which Windows mode you're using.
If an existing problem doesn't reappear when you start in safe mode, you can eliminate the default settings and basic device drivers as possible causes. If you don't know the cause of the problem, you can use the process of elimination to help you find the problem. Try starting all of the programs you commonly use, including the programs in your Startup folder, one by one to see if a program might be the cause of the problem.
If your computer automatically starts in safe mode without prompting, a problem with your computer might be preventing Windows from starting normally. If you think the cause of the problem might be a recently installed program or device, try using Recovery in Control Panel. For more information, see What is Recovery in Control Panel?
For more information about working in safe mode, see the following Help topics:
Advanced startup options (including safe mode)
Start your computer in safe mode
Diagnostic tools to use in safe mode
Troubleshooting problems while in safe mode
Which drivers get loaded in safe mode?