you might have left over files and registry keys from the first installation even if you used the control panel uninstall sometimes files and registry keys can be left behind https://help.ea.com/article/manually-uninstalling-the-sims-3
my internet is bad today sorry for slow replies i'm digging around for soloutions
at any stage was the game installed via digital downlad as that may be th efiles and registry keys you need to find
>_< what a nuisance for you , the only other thing to do is a system restore or a complete restore of your computer BUT don't do anything yet i'm going to post your issue in the helpers corner as someone else may have a solution for you
