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If your computer is already turned on, click on the Start menu and select “Restart” from the dropdown menu next to the Lock button. The Advanced Boot Options menu will display on-screen. If the Advanced Boot Options menu does not display, restart your computer and continue to press F8 repeatedly before the Windows logo displays on-screen. ”  ”  ” The System Recovery Options menu will display on-screen. ”  ”

Summary:
Power on your Windows Vista computer. Press the F8 key repeatedly as your computer boots up. Use the arrow keys on your keyboard to highlight “Repair your computer. Press the “Enter” key. Select a keyboard layout from the options provided, then press “Next. Select your username from the dropdown menu and type your Windows Vista password. Click on “OK. Click on “Windows Complete PC Restore. Choose the restoration point to which you want the state of your computer restored. Click on “Next.