Or just get a new comp/wait until you have one that can run it? I just run ARK on my mom's boyfriend's machine or use my Windows 8 HP despite my hatred of that OS. ARK uses about a minimum of 4.5GB RAM, too.
HP computers with a dedicated graphics card can run ARK, an Alienware could likely run it or a Desktop PC. I've never refunded a game, I've only waited until I had something that could run it.