hiya broomie. i recamend you do this.
it's to find out you Basecore. ie what memory you have.
got to start menu. type in Windows Experience Index. you will see Check Windows Experience Index click on that. in the next window bottom right you will see Re-run the assessment. click on that and run it. after it has finished. you will get a Basecore. on the right in a small square.
you should see this
you need at lest 3.0 or more to run the sims3.
my basecore is 4.0
my processor is 7.0
my memory( ram ) is 7.1
my graphics is 4.0
gaming graphics is 5.4
primary hard disk is 5'9