Uninstall guide

Hello, everyone! I'm new here so, nice to meet you. Usual, I'm stupid when it comes to use new things and all movements went bad.. I got Kali Linux recently on my laptop. Actually, I'm only Wi-Fi user and it's difficult for me to change to cable because I don't have necessarily things to do this. My little problem is that I want to go back to Windows and I don't have absolutely no idea how to do that, because, first I searched on web on q lot of forums, guides and tutorials how to boot Windows with Grub loader but, this thing doesn't show me own Windows (8.1). Being an only Wi-Fi user, evident I don't have network connection on my laptop. Another problem is that I don't have USB Flash Drive or a CD with Windows.. hopefully I can get one but I don't think so.. if you can help me, I'm here with every new message with a method to solve this. If I need something that can help with this, I'll hardly try to get these things. Please, if you can, help me. I don't wanna lose pictures and videos with me from when I was 3.. :(

Edit: you can contact me on WhatsApp +40728055936