Will I be able to return to factory settings later if I upgrade my OS?

joo-hyun

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Oct 5, 2011
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So I want to upgrade my ASUS N55SL Windows 7 laptop to Windows 8 but I might want to return to Windows 7 later if I don't like it. Will I be able to return to factory settings again later if I change my mind about Windows 8?
P.S. I don't have the recovery disk. I didn't get one as I purchased the laptop as factory excess.