Advanced Boot

A) Press and tap the F8 key about every second until you see the screenshot below.
NOTE: If the Windows startup logo appears, you will need to repeat steps 1 and 3 again.

 If you dual boot, then you will need to select the OS you want to use the Advanced 

Boot Option for and then press F8 Use the arrow keys to select an advanced option to start Windows 7 into and 

press Enter. (See screenshot above)

NOTE: See the table below for a description of each

Repair Your Computer Shows a list of system recovery options that you can use  to repair  startup problems, run diagnostics, or restore your system.  If Repair your computer isn't listed as an option, then your  computer doesn't include preinstalled recovery options, or your  network administrator has turned them off. You could also boot  from a retail Windows 7 installation disc to  see the System Recovery Options. Safe Mode This starts Windows 7 with a minimal set of drivers and services. 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 the display to identify which Windows mode you are using. If an existing problem does not 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 System Restore Safe Mode with Networking This starts Windows 7 in safe mode and includes the network  drivers and services needed to access the Internet or other  computers  on your network. . You should choose this option if you think you may need to access the Internet or your local network while troubleshooting in Safe Mode. Safe Mode with Command Prompt This starts Windows 7 in safe mode with a command prompt  window instead of the usual Windows interface. To exit from here,  press Ctrl+Alt+Delete or type Exit and press Enter. This  option is intended for IT professionals and administrators. Enable Boot Logging Creates a file named ntbtlog.txt, that lists all the drivers that are  installed during startup and that might be useful for advanced  troubleshooting.   Enable Low Resolution Video (640 X 480) Starts Windows 7 using your current video driver and using low  resolution and refresh rate settings. You can use this mode to  reset your display settings, or to use a television monitor with your  computer if needed.  Last Know Good Configuration (advanced) Starts Windows 7 with the most recent registry and driver  configurations that worked successfully. Every time you  turn your computer off and Windows 7 shuts down successfully,  important system settings are saved in the registry. You can use  those settings to start your computer if a problem occurs. For  example, if a newdriver for your video card is causing problems,  or an incorrect registry setting is preventing Windows 7 from  starting correctly, you can restart your computer using Last  Known Good Configuration.  Directory Services Restore Mode Starts Windows 7 domain controller running Active Directory so  that the directory service can be restored. This option is intended  for IT professionals and administrators.  Debugging Mode Starts Windows 7 in an advanced troubleshooting mode intended for IT  professionals and system administrators.  Disable Automatic Restart on System Failure Prevents Windows 7 from automatically restarting if an error causes  Windows 7 to fail. Choose this option only if Windows 7 is stuck in  a loop where Windows 7 fails, attempts to restart, and fails again  repeatedly.  Disable Driver Signature Enforcement Allows drivers containing improper signatures to be  temporarily installed.  Start Windows Normally Starts Windows 7 in its normal mode to the logon screen or user desktop.  This can be helpful after a improper shutdown.