Sims 3 isn't working! Or Generations, or Late night!?

UGH! I bought sims 3 (base) about a week ago, at the same time I bought Generations. ( Both were from an EB games in Vancouver, Canada) I only put Generations on 3-4 days later. They both worked fine and it was a lot of fun! **BUT THEN** (Insert jaws soundtrack) I went out to Walmart to buy Late Night (When I was back home in Toronto), So I try to download it and it didn't work! I wanted to be a vampire damn it! So my Dad uninstalled every sims thing I have, so now When I try downloading everything up again, I can't play anything! WHAT THE FUUUUUUU *-* Someone, HELP! URGHER BLERGH SHARZAHJA *Grumble Grumble* By the way, I'm a Mac, and all the games are "WIN MAC DVD-ROM SOFTWARE"