JameeBranson With only 4 GB RAM installed, having the system use around three quarters of it after startup isn't unusual. But I might be able to help bring that number down, to free up more resources for Sims 4. If you're interested, please post the screenshot of the Task Manager's Startup list I requested.
The message about needing to switch to the 32-bit version is because of your 4 GB memory plus how much is already in use when you launch the game. If you don't see any other problems, and you can play normally, you could ignore this message, at least for now. But if you do notice performance issues, or you're not able to play at all, that's what I'm trying to help you fix.
Having said that, your computer's hardware is below the game's minimum requirements, so I don't know how much of an improvement you'll get. I'm not saying you can't play, only that there might be a ceiling to what you can realistically get out of this game.