Are you installing the game from Origin download or DVD ?
There was someone else with a similar issue but I can't remember if it was solved.
Did you try to manually uninstall ?
https://help.ea.com/article/manually-uninstalling-the-sims-3
I uninstalled it from the programs directory under the control panel, and it uninstalled successfully with the exception of that one file. I cannot delete it, manually or otherwise, as it keeps telling me an administrator is the only one that can access them (which I am). I cannot move it, I cannot edit permissions on it.
There's a program called unlocker (just google).
That should unlock the file so you can delete it.
Man, even unlocker couldn't deal with it initially; had to remove the folder upon reboot. Worked though, thanks much! Gonna see if I can get the installer to work properly this time.
