I am currently using the beta build of windows 10 and when it releases I wont have an operating system anymore. I was wondering if I should maybe buy windows 7 and then hop on the free upgrade train to 10 instead of waiting for 10 to release and paying 120 for it. Is this a viable option? If I have to reinstall my OS in the future afterwards would I be able to install 7 and then upgrade again...?