Save And Load System?

It's a game that continues for a long time and isn't done in a hour, so it is pretty annoying that if the player re-opens the game he has to do everything over again. So, does anybody know how I can make a save/load system? Like that on the first form of the game there is a "Save" and "Load" button. If the player presses the "Save" button, the program automatically saves the progress of the player in a file somewhere on the harddisk of the player, and if the player presses "Load", the program automatically loads the file he saved, so the player doesn't have to start all over again.