[Nixtren]

Your case is very strange. Unless someone is specifically targeting to infect you I would say most probably you're restoring the virus from the backups. If someone physically tampered your keyboard it's possible, as they could possibly reprogram the chip inside the keyboard. Tampering the keyboard firmware via software is impossible, unless your keyboard is backdoored (someone physically tampered your keyboard) . I sound like I'm making a science fiction movie by writing this post.