How to troubleshoot if booting files corrupted?

Depends on what OS is  that you asking about, Abdei, your answer is incorrect and indicates lack of knowledge in your field.

in command prompt i use the command sfc /scannow If any corrupt files are found, they are repaired automatically and a log file is created, generally found at this location: C:\\Windows\\Logs\\CBS\\CBS.log

or used System Recovery Options in windows that consist of(startup repair - system restore -system recovery image )

OR I CAN USED SYSTEM REPAIR DISC