it was a rouge anti virus. it had 3 payloads. one it simulates a disk drive c being deleted every restart, 2nd one is it brings up Porn every 2 seconds and the 3rd one is that it laughs at you. its gone now. but if you somehow stumble upon it DONT DOWNLOAD IT.
Yes, it downloads NAVASHIELD on your computer
Yes, there are some "antiviruses" that are actually just viruses themselves, they are called rouge programs. They trick you into thinking the program is safe to download and received lots of good reviews, and if you download and open it then you're screwed. They pretend to be a good program and find lots of "viruses" but they just end up making you want to tear out your hair in anger. An example of a rouge antivirus is Navashield.