Ok, but what happens if I upgrade now my win 7 to win 10 and I need to format and reinstall the whole system after the expiration date because of hardware failure or virus infestation ?

Hi

What happens if I reserved a copy of windows 10 but I don't want to upgrade it ? To make a story short, I have 2 PCs with windows 7. Both PC had reserved win 10 but I cannot upgrade it because...