Hello,
If what Beef Sticks suggested didn't work, please try backing up and removing this folder completely: DocumentsElectronic ArtsThe Sims 3
And since I love to keep drivers up-to-date, try downloading and installing this driver for your graphic card (For Windows 64-bit): http://www.nvidia.co.uk/object/notebook-win8-win7-winvista-64bit-310.70-whql-driver-uk.html
During the installation, choose "Custom" and "Clean installation". Don't forget to restart your PC afterwards.