I could care less if I sound professional or not...
You may not care how you sound on this Forum, but I do! So, if you want some help, you'll have to calm down and stop giving snarky responses.
1. If you will go to the
Technical Help board, you'll find instructions for manually uninstalling Sims 3, World Adventures, and High End Loft. Follow these instructions step by step and remove the programs starting with the newest one first. It's not as simple as removing them through Control Panel. These instructions also include saving your game files.
2. Do some maintenance on your computer with Disk Cleanup and Defrag.
3. Begin installing the games, starting with Sims 3, then World Adventures, then High End Loft, then Ambitions. Be sure you have your Product Code numbers for each installation as you will be required to type them in during the install process.
Optional: You may want to restore your computer to a previous date so you can start all this fresh. To do the system restore, click the start button in the lower left corner and click on Help and Support. In the search box, type "system restore." Then click on any of the subjects that come up about System Restore and you'll find instructions and a link. Follow the instructions from there.