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Select a keyboard layout, and then click Next.

(If Repair your computer is not listed as an option, then your computer does not include preinstalled recovery options, or your network administrator has turned them off.)

On the Advanced Boot Options screen, use the arrow keys to highlight Repair your computer, and then press Enter.

If your computer has more than one operating system, use the arrow keys to highlight the operating system you want to repair, and then press and hold F8.

If the Windows logo appears, you need to try again by waiting until the Windows log in prompt appears, and then shutting down and restarting your computer. Press F8 before the Windows logo appears.

If your computer has a single operating system that is installed, press and hold F8 key as your computer restarts.

Remove all floppy disks, CDs, and DVDs from your computer, and then restart your computer using the computer's power button.To open the System Recovery Options menu on your computer This set of tools is on your computer's hard disk and on the Windows installation disc. The System Recovery Options menu contains several tools, such as Startup Repair, that can help you recover Windows from a serious error. This article provides information on System Recovery options in windows 7.

Download windows 7 installation disc or usb flash drive