Problem with 64-bit/32-bit Sims 4

I recently bought Cats and Dogs for The Sims 4 yesterday. Whenever I went onto the game it said that I was running the 32 bit version of the game, and that I needed to change it to the 64 bit version of the game if I didn't want it to be lagging too much. I went out the Sims 4, and on origin it says that I am running the 64 bit version of the game. I do not understand why it won't run the 64 bit version, when it has been running the 64 bit version for 2 years now. I played the Sims 4 earlier this month, and I did not have this problem. I tried to run the game on the 32 bit version, then change to 64 bit version to see if that would knock it back to normal, but I still had no luck. Has anyone else had this problem? or is there a reason this might occur? I really want to be able to play the new expansion for the game, but now i feel like I wasted my money if I can never play it. (I tried playing it after this message came up, and it was unbearably lagging.) If anyone can help, please do!!