This product requires an installed copy of sims 3, When sims 3 is clearly intalled on my computer.

Try uninstalling following the instructions here: http://simswiki.info/wiki.php?title=Game_Help:TS3_Uninstall

Also get rid of Origin completely (manually): https://help.ea.com/article/manually-uninstalling-origin

Use ccleaner (just google) to go over your registery again and remove the program from the add/remove menu if they are still showing there.

Then if everything is clean and gone, try installing again.