If you are talking about the original game and not Phant II, You can do it via the preferences in the game's control panel. If this is the original CD version and not the GOG version, this installer will do it for you automatically and install the entire game to your hard drive with out the need to swap CD for game play.

Thanks buddy! The option screen in-game was cluttered and wired. I found the option for full video which took away the scanlines! Thank you!!