Je suis bloqué

Windows failed to start. A recent hardware or software change might be the cause. To fix the problem :
1. Insert your Windows installation disc and restart your computer
2. Choose your language settings, and then click "Next"
3. Click "Repair your computer"
If you do not have this disc, contact your system administrator or computer manufacturer for assistance.
File : \Boot\BCD
Status : 0xc000000f
Info : An error occurred while attempting to read the boot configuration data.
je n'arrive plus a booter sur mon disque C,j'ai booté sur un disque d'install,la je voie mon disc c qui est devenue d mais je sais que faire pour reparer sans si possible ecraser mon ancien system
cordialement