Power Antivirus is a new version of Power-Antivirus-2009, a fake security software from the Vista Antivirus 2008, Antispyware 2008 XP, System Antivirus 2008, Internet Antivirus, Smart Antivirus 2009, MS Antivirus, Advanced Antivirus family... that detects infections on a clean system.
SmitfraudFix removes the infection.