Mackeeper ads

Hi
some days ago, i visited some torrent sites but dint download anything... now i keep getting pop ups and new windows with a Mackeeper software to clean my Macbook pro. I went to my software and saw a Mackeeper software downloaded.. i had never seen it before , so i uninstalled it. however... now also, windows keep opening with messages of my Macbook infected and to use Mackeeper. i checked ... its already uninstallled. what do i do? advice please... Thanks