How to Open a Command Prompt at Startup in Windows 7

From Advanced Boot Options

   Note

This starts Windows 7 in safe mode with a command prompt window instead of the usual Windows interface.

1. Boot to the Advanced Boot Options screen.

2. Select Safe Mode with Command Prompt and press Enter. (See screenshot below)

3. Windows 7 will now start loading Safe Mode with Command Prompt. (See screenshot below)

4. When finished, you are now in Safe Mode with Command Prompt. (See screenshot below)
NOTE: To exit from here, press Ctrl+Alt+Delete or type Exit and press Enter to restart the computer.