The Advanced Boot Options screen lets you start Windows in advanced troubleshooting modes.
By pressing the F8 key before Windows starts, you'll be presented with the following;
Repair Your Computer
Safe Mode
Safe Mode with Networking
Safe Mode with Command Prompt
Enable Boot Logging
Enable low-resolution video (640×480)
Last Known Good Configuration (advanced)
Directory Services Restore Mode
Debugging Mode
Disable automatic restart on system failure
Disable Driver Signature Enforcement
Start Windows Normally