If you don’t want Win7 there are many who will buy the computer with it installed. Been a hot item for a while.
I like Windows 7; my wife wants the 10.
Her machine is a Dell Power Edge Server, with 8 cores and 32GB RAM. I’m not selling the PC as I invested 2 days trouble shooting and repairing the motherboard 3 years ago (spider crawled into a card slot and shorted out a munch of stuff).
I am very comfortable with this PC and will be keeping it for a few years more.