Have a laptop

Is it an Apple, Windows, or other laptop?

If Windows, what version?

When you say "it works", what it wrong with it that you want to reset it?
 
What flavour of laptop? Win10 or earlier? Mac?

with Win10 you can create a Recovery Drive simply. You will a16Gb USB stick. Create the recovery drive then cause the PC to boot from the USB DRIVE AND then follow the on screen instructions.
 
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