The first step is to use Startup Repair that is a great option when you are not at ease using the Command Prompt. It is a program in WinRE that checks that finds typical boot issues. It is capable of fixing automatically the BCD, boot sector, and other system files which cause the 0xc000000f (https://datarecovee.com/error-code-0xc00000f/) error. In case it works, it offers a fast solution without the need to issue manual instructions.