My PC wasn't working properly so I did the hard restart 3 times to bring up the boot settings so I could reset my PC, I did the option that said it will remove everything that wasn't on the PC since the start such as Personal files, and it said I can restore them whenever I want. I assumed by doing this it would leave the OS and just delete everything else, but now I'm stuck on the bios screen that says "An operating system was not found. Try disconnecting any drives that don't contain an operating system. So if there's a way I can get my OS back without paying for another one can you please help. Ps I also don't know the key because I baught the PC off someone else