How do I restore Windows back to an earlier copy?

Hello friends,

I am facing a problem related to computer. The problem is that how do I restore Windows back to an earlier copy. So, give me a suggestion how to fixed this problem by wasting a lake of time

Thank you

Earlier Windows copy? You mean you updated to higher version of Windows, such as Windows 8 and want to back to Windows 7? Or you want to make your Windows back to the start, no program installed, "back-up"?
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