How do you do a full dell system restore on windows 7 computer?

How do you do a full dell system restore on windows 7 computer? I have already tried Ctrl and F11 at startup and F8 but it does not workHow do you do a full dell system restore on windows 7 computer?I know you said that you tried F8 but try again but repeatedly press it after the computer boots untill you see the advance start up screen. highlight repair your computer by using either the up or down arrows on the key board. let it load choose your language then log in. An option screen should open up for you to repair your computer. don't errase your hard drive unless you have the recovery media disk/cd

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