In the event that you need to make changes to the Basic Input/Output System (BIOS) of your computer, need to run command-line utilities or are not able to boot into Windows, you can boot to the command prompt (DOS) to install or run DOS programs or run system recovery applications.
Since the release of Windows XP, Microsoft has made it relatively simple to boot into DOS mode or to the command prompt. In fact, the process for doing this has not changed very much over the years. Windows 7, though, does provide a few more options for making changes to your system from the command prompt.
Shut down your PC and then power it on again. Alternatively, click the "Restart" option on the Windows "Start" menu.
Press the "F8" key a few times as soon as you see the boot Power On Self-Test (POST) screen or manufacturer logo screen. Wait for the computer to display the "Windows Advanced Options" menu.
Press the down-arrow key to move the cursor to the "Safe Mode with Command Prompt" option and then press the "Enter" key. Wait for the computer to boot the Command Prompt and then install applications or run software utilities as needed.
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