For some reason, anti-virus software just won't work on my brother's computer. I don't know what the idiot did to it. Something is stopping Norton Anti-Virus software, and even McAfee from even starting up. The programs start to load, but then shuts down automatically. I tried scanning it from safe-mode and it detected nothing, but that could be the result of not having updated virus definition since it can't launch+connect to the internet in normal mode. I tried Ad-Aware(updated) and it still doesn't detect anything. As far as I know, the PC isn't displaying any weird symptoms and it's not sending out anything to the net. Anyone have ever encounter this before? I don't want to spend hours reinstalling everything since I'm not using the PC(even though it's mine) in his room.