You need to (using a different computer) search for “windows 10 iso” and download that. (make sure you are downloading it from microsoft) then click on download tool now (you will need a 8GB USB stick) follow the steps to create installation media. Then plug it into the surface. Hold the power button and volume up (+) at the same time until you see a menu appear. go to the one labeled “Boot” then make USB Storage the first selection. then restart the computer and click install. then when it gets to “easy” or “custom” choose custom. then click next. then it should be ready to go in a while. make sure you do all updates once it’s up and running. it wont work properly till you do