Do you have a win 8 installer? If not, on another PC, download the Win 8 media creation tool and use it to create an installer on USB or DVD
Change boot order on laptop so its USB or DVD first, boot drive second
boot from installer, on 2nd screen after languages, choose repair this pc, not install
choose troubleshoot
choose reset this PC
Before you reset, you might want to try troubleshoot/advanced/Automatic repair, it might fix the problem without needing a reset
Do you have a win 8 installer? If not, on another PC, download the Win 8 media creation tool and use it to create an installer on USB or DVD
Change boot order on laptop so its USB or DVD first, boot drive second
boot from installer, on 2nd screen after languages, choose repair this pc, not install
choose troubleshoot
choose reset this PC
Before you reset, you might want to try troubleshoot/advanced/Automatic repair, it might fix the problem without needing a reset