You do not need to consult best buy to reinstall. You can do it a couple of ways. If this computer came with Windows 10 you can do a factory reset that will take it back to the day of purchase.
You can access the repair menu by booting the computer and waiting for the spinning circle. Do a hard shut down with the power button at the spinning circle by keeping the power button down. Do this for a number of times and the repair screen will appear. This is if you do not want any data off the computer.
Edit: Tapping F9 at boot may give you the recovery manager.
Edited by JohnC_21, 08 May 2016 - 04:17 PM.