its because windows comes intalled on most pcs for sale and linux doesnt. Therefore you have to normally make an extra effort to by a computer already with windows on it delete it and install an operating system that may or may not work on your new pc. so most peope understandably stick with the crappy windows it comes with. They never realise the viruse; bloatware; license keys; extra expenses; bad performance; limited functionality are simply features of the bad operating system they have accepted. Its a bit like buying a tv with content only from one movie studio and wondering where it all goes wrong. At one time windows was good but now is a liability but a liability with a huge market share.