The present invention may be embodied in a method, performed in a computer system having a disk drive, for installing an application program for execution under a user's preferred operating system without requiring user intervention. A command is received by the disk drive for reading a first data block to initiate a bootload of the user's preferred operating system. The disk drive detects the command and transfers a second data block which bootloads an installer program for installing the application program. The installer program is executed in the computer system to transfer the application program from a protected area of the disk drive to a user area of the disk drive, to modify a parameter of the user's preferred operating system to cause the application program to be loaded during a bootload of the user's preferred operating system, and to reboot the system to bootload the user's preferred operating system.