Sims 3 Updates

Aye ,
I was starting up the launcher for the sims 3 like I usually do and then I saw new updates were available so I updated it but then as soon as it finished and I pressed play , It wouldn't play . I guess when I updated it , it had more requirements and my computer didn't meet them . I want to know if you can uninstall an update ? Because I don't want to uninstall the game completely because then I'm going to have to start all over again . I also don't know how to save the custom content on the computer to put into another game once you've reinstalled it . When I go onto the games section of my computer and click on the sims 3 icon it says ;
Game Recommended Rating : 4.5
Game Required Rating : 3.5
Current System's Rating : 2.7
Then when I go to the more information section, it says the part that's rated 2.7 is the graphics. Before the graphics were fine with the previous update I had, but I don't know what to make it better now & most of all I don't know if I can uninstall an update ! Pretti Pretti Please with all tha sims 3 games in tha world and a good performance computer on top ! Can somebody please help me figure out what to do . Because it's sort of boring without the sims . Annd after all that homework . I come to the computer knowinng I cann't play the sims = ( Somebody musst understand my painn .