Well , my father had a virus that took over his comp. i couldn't do anything ,"that i knew of " to remove it.It was locked up you couldn't go anywhere, not even in safe mode.So i took it to a shop they said they could remove it without wipeing his harddrive i said ok go for it , 87 dollars later we get it back you can do stuff but the "PC Defender " Rogue anti-virus was still there . Now he is haveing trojans show up all the time. I removed Pc-defender from the program list but it still has trojans showing up when we scan with AVG,IOrbits 360, and Malwarebytes'. So i thought that maybe we just need to wipe it out.