Safe Mode is a troubleshooting option that limits Windows operation to basic functions. Safe Mode starts Windows with only core drivers and services. Safe Mode with Networking starts Windows with only core drivers, plus networking support. To start your computer in Safe Mode or Safe Mode with Networking, follow the instructions below.
Immediately after the computer is powered on or restarted, tap the F8 key on your keyboard in 1-second intervals.
After your computer displays hardware information and runs a memory test, the Advanced Boot Options menu will appear.
Use the arrow keys to select Safe Mode or Safe Mode with Networking and press the Enter key on your keyboard. For more information about Safe Mode options, see Safe Mode options for Windows Vista/Windows 7.
When you have finished troubleshooting, repeat steps 1-3 and select Start Windows Normally to return to your normal Windows configuration.
Type in your username and password to start Windows in Safe Mode with Networking.
Click Start → Power and then click Restart to return to your normal Windows configuration.