Window7 install

How do you install win7

Someone help window basic need to activate to use upgrade link I bought cheap to win10 only comes from window7basic which I have on my old dell ready for upgrade . Do I use link and download win10 then send it to blank cd and boot from that will win 10 be on cd then I type in upgrade key. I am new at this.

my computer is very slow any body teal how to speed up computer

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