Hi, maryte. If the pop up keeps appearing even though Norton has quarantined it, it might be worth visiting one of the free malware removal forums we recommend, where an expert will work one on one to clean your system of any infection.
http://www.bleepingcomputer.com
http://forums.whatthetech.com/
http://www.geekstogo.com/forum/
http://www.cybertechhelp.com/forums/