I get the message when I want to start the launcher. I cleaned it today and uninstall world adventures afterwards. No I didn't uninstall the basegame because I couldn't find the CD.....
Try bypassing the launcher as described here: http://answers.ea.com/t5/The-Sims-3/FAQ-Troubleshooting-Steps/td-p/714/
This is just for testing purposes to see if the game itself works.
If that doesn't start either, uninstall WA again, THEN clean out the registery not the other way round. Also try the factory reset linked in the post before.
