The sims 3

gungawee036  Click Windows key-R, enter appwiz.cpl in the run box in the lower-left corner of the screen, click "Turn Windows features on or off," and you should see .NET Framework 3.5 near the top of the list.  If the box next to it is empty, click it to install, and restart your computer.  If the box is filled in or checked, click it to uninstall, restart your computer, and repeat the process, clicking the now-empty box to install (and restart again).

When I opened the game, it looked like this.

gungawee036  What happens when you try to play?  If you get an error message, please post a screenshot or write out the entire text.