Have you tried enabling Data Execution Prevention?
Open System Properties.
Go to Start.
Then Control Panel.
Then open System.
Click Advanced System Settings. If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
Under Performance, click Settings.
Click the Data Execution Prevention tab, and then click Turn on DEP for all programs and services except those I select.
Click on Add and browse to TS3W.exe under...
32-bit Windows: C:\Program Files\Electronic Arts\The Sims 3\Game\Bin
64-bit Windows: C:\Program Files (x86)\Electronic Arts\The Sims 3\Game\Bin