Kangeroojackie If your computer has a 12th-gen or newer Intel processor, please see the accepted solution of this thread:
https://answers.ea.com/t5/Technical-Issues-PC/Sims-3-won-t-open-Alder-Lake-Intel-12th-gen-CPU/td-p/11057820
Otherwise, please run a dxdiag and attach it to a post. Hit Windows key-R, enter dxdiag in the run box, wait for the scan to finish, click "Save all information," and save the file to your desktop. From there, you can attach it to a reply using the camera (Insert Media) icon included with the other formatting options.