This Chameleon fake Antivirus is looking for the OS version (XP, Vista, Seven) and changes its name and skin:
Zorton Win 7 Protection 2014,
Zorton Win 8 Antivirus 2014,
Zorton Vista Protection 2014, (...). It detects fake infections and displays alert messages to scare users. It belongs to the
Braviax/FakeRean family.
Thanks to
@kafeine for the sample