Original post : Windows won't start - Guide for Windows XP, Vista, 7, 8, 10.
chkdsk C: /r
C:
sfc /scannow /offbootdir=c:\ /offwindir=c:\windows
c:
exit
msconfig
Before following these fixes, go to General fixes if Windows won’t start.
bootrec /FixMbr
bootrec /FixBoot
bootrec /RebuildBcd
rstrui.exe
bootrec /ScanOs