You also need to make sure all of your drivers are updated and current. Make sure that you only download drivers from trusted sources, though, because downloading fake drivers can really mess up your system.
Concerning this I would clearly encourage you to really ONLY
download the drivers from the original website for your laptop and not from third-part websites!!! I for example bought myself an Acer Laptop last year and also put win8 on it. For the drivers I only use those from the Acer Website. There is the possibility to choose exactly your own model and they propose you the latest drivers for all the components inside your computer
... concerning games there are sadly some huge problems concerning WIN8 and older games. In my case for example "Battle of Middle Earth" don't work anymore with the new OS on it. It's crap but there isn't much to do against it -.- ... in this case I just say Windows-Bullshit
... Maybe you should look up in the internet concerning Sims2 compatibility with Win8! - I for example wanted to install the old "Trackmania Sunrise" on the notebook. It didn't worked and after some searching in the internet, I found a tutorial how to make it playable on Win8. After totally ~4 Restarts and ~6 Patches the game was "made" compatible to the new OS.
I hope you can find a way to resolve your problem!
... Maybe I can do some research for you later this week after I had my exam^^