2 Operating System

Well Apple is becomming more popular and android is becomming more popular for cell phones but for desktops the market is mostly made made up by Windows 7/8/8.1/10. Note officially only these versions are supported now by Microsoft on last check. If you get Windows 10 on a USB Stick you may be able to upgrade without a serial number although after awhile some of the features may say you need a license to use this feature, personally I havenn’t noticed much barriers.

https://en.wikipedia.org/wiki/Usage_share_of_operating_systems#Web_clients

https://en.wikipedia.org/wiki/Usage_share_of_operating_systems#Desktop_and_laptop_computers

Google ‘Windows 10 download