Several boot loaders for encrypting and decrypting the disk

The program should do so, when a person restarts the computer, he begins to encrypt the disk, and it is displayed as follows: Encrypted sector 1/XXXXXX (1%) if a person restarts the computer, it will appear a window with a proposal to enter the password, when he enters the right password, then begin decrypting the disk In the program (console application), the user can specify the text that will show him after the encryption of the disk.