Video Card causing in-game issues

Sorry if this has been posted before or its in the wrong area but I have went through several posts and nothing quite close enough to my problem.

What I have:

Windows 7 Ultimate
Base Game (store bought)
High-end Loft (store bought)
Ambitions (games4theworld)
Late Night (games4theworld)
Pets (games4theworld)
Showtime (games4theworld)
Supernatural (games4theworld)
Seasons (games4theworld)
70's, 80's & 90's (games4theworld)
University Life (games4theworld)

I have CC's and Mods but they have never been huge issues with in-game play. Some minor clothing bugs mainly with newborns and kids but that's not my problem. I have a NVidia GeForce 9400 GT video card and I switched it with the exact same one except one with 1GB of onboard RAM to see if it would help the lagging. I have tried updating the drivers, even uninstall and re-installing the drivers, still the same in-game play problems. I have nraas master controller and cheats MOD installed and it kept popping up with the local sims job errors and my sims would disappear from taking a shower to be somewhere else on the lot while the shower was still going and nobody in it. Interacting with other sims causes my sim to disappear and reappear. Sometimes I can't get my sim to cook. It will show the command and then go away while the pop up for the command is still showing. I only started having these issues after I installed the new video card.

I hope I have explained myself well enough and I apologize if it doesn't belong here.

Thank you.