options if the machine will boot to desktop;
1. press [windows key] + [x] and then press [k] to open the disc manager... take a screen shot of this page and post it.
options if the machine will NOT boot to desktop;
2. yes you can install another windows 10 but that doesn't fix the issue
Have you got a bios lock running on this laptop... most of them do... has it been disabled?
p.s make and model of the laptop... any mods you have done to the parts?