Rick Dangerous is a great little side scroller. I first played it on the Amiga in about 1993 but never played it on the pc, but I believe they would be exactly the same. Rick Dangerous reminds me of Indiana Jones. Your character runs around in ruins of an ancient city dodging falling rocks and dart spitting statues. Rick Dangerous is kind of like Super Mario Brothers but without the powerups, so if you enjoy platform games or have played Rick Dangerous before, give it a go.
BigOrno has made a remake of Rick Dangerous using the superior Atari graphics. You can find it at http://www.bigorno.net/xrick/
Murlock has made a compiled windows port of BigOrno's remake which you can download at http://www.murlock.org/progz/