some commands to try to repair a windows system.

use F8 at startup to get the command line.

get the disk names

  * diskpart --> list volume --> exit
or
  * wmic logicaldisk list brief

  * chkdsk c: /f /r (scan and repair bad clusters)
  * rstrui.exe (run restoration points)
  * sfc /scannow (replace broken system files)
  * bootrec /fixboot or bootrec /rebuildbcd (repair boot)