You can use a USB stick to reinstall Windows 10...
i recommend you use Rufus (i.e. https://rufus.akeo.ie/) to make the USB installation bootable as the official Microsoft tool does not seem to work properly even though you will need the official Microsoft tool to download the Windows 10 ISO which you can get here... https://www.microsoft.com/en-in/software-download/windows10
so basically... with the official Microsoft tool you download the Windows 10 ISO (which will be the new Anniversary Update (i.e. build 14393) released earlier this month) file to your computer and then after that's finished use the Rufus tool to make your USB drive bootable and from within Rufus you select the Windows 10 ISO file you downloaded. here is the general process to get it working which is pretty straight forward... http://mspoweruser.com/how-to-create-a-bootable-usb-drive-for-windows-10/ (follow 'the easy way' on that link)
just to be clear... Rufus will delete all data on your selected USB device so make sure you got any important data on it backed up elsewhere.
with all of that said... it's probably best to clean install Windows 10 anyways which means when you boot from that USB device that contains Windows 10 you want to make sure you delete the data on your hard drive (or SSD) before proceeding with installation.
NOTE: but clean installing Windows 10 will remove ALL data on your laptop (i am assuming you only got one hard drive (or SSD) in it given it's a laptop) so you want to make sure you backup any important data before proceeding!
it's possible you might need to find Windows 10 drivers for the laptop etc etc. so, just in case, it's probably a good idea to find the model of your laptop and see if the manufacturer has any Windows 10 specific drivers for it as if it does it's probably a good idea to install those after Windows 10 is up and running again.
also, i used that and it worked on a USB card reader with one of those SD cards inserted. but basically anything USB should work as long as it's 4GB or larger storage space on it. i just tested it out recently just to make sure it would boot and it does even though i had to enter my bios and enter a certain menu to select the USB device with the Windows 10 install files on it for it to boot as it don't see to be as easy to boot from as the usual DVD drive option.
but assuming you can't get into Windows to do that stuff and you don't have any installation media your going to have to find someone who has a computer who can setup the above stuff for you and then you should be good. but... i am not sure how it will play out though given there is different versions of Windows 10 like Home and Pro and x86/x64. but if i took a guess your probably running x64 Home edition which, from my guess, is what the MediaCreationTool (that Microsoft program i mentioned above) will likely select anyways since most people are not likely running Pro version of Windows 10 unless they upgraded from say Windows 7 Pro etc or higher.
p.s. in general... if someones computer/laptop is all messed up beyond a certain point or if it's been many years since Windows has been installed i just default to the clean installation method as that helps ensure everything is in good running order.
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