I read somewhere (?) that if you go to the Systems Requirements Lab and check your system to see if you can run Spore, and it CAN run Spore, then you should be able to run The Sims3.
http://www.systemrequirementslab.com/referrer/srtestI passed on everything for Spore, but this is the only part I am worried about, and I hope it will be enough:
You Have: 2 processors running - Intel(R) Core(TM)2 CPU 4300 @ 1.80GHz
I'm not very computer techy. Does anybody know if this meets The Sims3 requirements for Vista?