I have a problem with my laptop (Lenovo G40-45). At first I'm installing my laptop with Windows 10, but suddenly after a couple of months my hard drive fails and I'm replacing it with my old hard drive with Windows 7 installed, but I'm formatting it to install Ubuntu. But now when I'm trying to install Windows 10, it shows the error "Your PC Needs To Be Repaired" with I think the error is 0xc000001 winload.efi . I've been trying to install it with USB Drive I created with Unetbootin when I'm using Ubuntu, and I tried installing Windows 8.1 instead, but still has the same trouble. My question is :
1. How to fix this without replacing my hard drive? I don't have enough money to buy one
2. My laptop has an OEM for Windows 8.1. If I'm trying to install Windows 8.1 or Windows 10, do I need to buy another product key? (Windows License is still written in my BIOS)
Thank you, and sorry for my bad English