Can see all games on downloaded programs list but not Origin

Hello, I just started using my computer again after not having used it for 4 or 5 months. I updated my PC, updated Origin, and I can't see any of my expansions, just Sims 3 base game. My games were NOT in the Origin client before I updated my computer and Origin, either. I can see all of my games in my Programs list on my computer. I tried searching for all my expansions to find their game files, hoping to find their icons so I could just reinstall them on Origin, but nothing. I appreciate any help! Thanks!!