@monakedi Try pulling your entire TS3 folder out of Documents and onto your desktop. If the launcher opens and you can load the game, a new folder will spawn with no content. You can move your saves and whatever else you'd like to keep from your old folder into this clean one.
If that doesn't help, please provide the specs of your computer, as well as the packs you have installed. In Windows, it would be very helpful if you ran a dxdiag and attached the results to a post here (use the Browse button).
If you're on a mac, here's how to provide your specs: