So I am a HUGE sims fan. I LOVE the Sims 3, and play it way more than Sims 4. However, with the new Cats and Dogs expansion coming to Sims 4, I would like to be able to reinstall Sims 4 and play it, but still be able to just play Sims 3 whenever I want. My laptop runs Sims 3 at the moment with...