(see screenshot below) A) Continue on to step 3. Boot to the System Recovery Options screen, and select the Command Prompt option. Restart your computer, and then start Windows 7 from the installation disc or USB flash drive as previously described. Boot from either your Windows 7 installation disc or Windows 7 System Repair Disc, and press Shift + F10 when at either screen below. Save the setting changes, and then exit the BIOS. (The USB flash drive might be listed under 'Removable devices' or something similar.) Select your DVD drive or USB flash drive as the first startup device. Boot order settings might also be listed under 'Advanced settings' or something similar. On the BIOS setup screen, choose the option called 'Boot order,' or something similar. If the Windows logo appears, you need to try again by waiting until the Windows logon prompt appears, and then shutting down and restarting your computer again. Usually, you must press a key (such as F2, F12, Delete, Esc) or a key combination immediately after you turn on your computer but before Windows starts.

Procedures vary depending on the BIOS manufacturer. On the startup menu, choose 'BIOS setup,' or 'BIOS settings,' or something similar. Newer computers often display a startup (or boot) menu. Turn on your computer, insert the Windows 7 installation disc or USB flash drive, and then restart your computer. The BIOS interface is designed for advanced users, and it's possible to change a setting that could prevent your computer from starting correctly. Warning: Be careful when changing BIOS settings.

Startup windows 7