Well I found one solution, kinda, I changed the jump button from ctrl to z. Now it works fine. Though I sure would prefer to use ctrl to jump buuutt not a huge deal.

Hi, I purchased the Commander Keen complete pack on Steam, and playing the first game, I can't run and jump at the same time. If I'm moving right, I have to stop moving and THEN jump, for example. Is there any way to fix this? Thanks Seth