A method for fast activating a computer function options by loading program image files is provided, including a data storage pre-installed with at least a program image file. When the user operates an option button, the computer loads and executes the program image file associated with the option button after the basic booting process of the operating system. This activates the multimedia device corresponding to the pressed option button. In the preferred embodiment, the data storage also stores a program image file index in addition to the program image files. The program file index stores the starting addresses and file size of all the program image files.