Hi
Having issues with re-installing your game could be the result of several things.
1. If you are referring to REGISTERING the game on Origin or the Sims 3 website see here:http://answers.ea.com/t5/The-Sims-3/Information-How-to-Register-The-Sims-3/td-p/387162 . Please note that if the game is second-hand, you cannot register the game twice. So, if it has been registered before, you cannot register it again.
2. Check that you're typing it right - it sounds silly but just check. You might be mixing up a S with a 5.
3. It is possible that there is still traces of the game on your computer. Try manually un-installing it here: https://help.ea.com/article/manually-uninstalling-the-sims-3 . Note that if you still have expansion packs or stuff packs on your computer, you will have to re-install them as well for all their additional gameplay and content to be read. In that case, while you're at it, I suggest manually unistalling all the games just to clear all game traces. If you have had the game on your PC before and still have the save files - make a backup to save them if you wish.
4. And lastly, try contacting EA: http://eahelp.ea.com/en/ . For help with navigating the site, see this: http://sims3.crinrict.com/en/2012/10/how-to-contact-ea.html
Hope this helps!!
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