Windows activation key

[Jijo]

Do windows laptops come with a paid activation key , if so where can I find it?

[manikyath]

normally laptops have a windows license sticker somewhere, like one of these:

 

otherwise, there's ways to extract it from the OS.

 

EDIT: oh, and with windows 10, once it has been installed on the laptop, it'll reactivate itself.

[doits]

in windows 10 it knows the hardware and can reactivate, older laptops with win 7/8 have a sticker on them.