best antivirus for PC

Before my computer best antivirus for PC does not work, because my computer has been poisoned, leading to a lot of information I have lost it, I was in a hurry, if that’s the case, then the computer I have not used it, I angrily to the leadership of the office, said it is required to give me the re allocation of a computer, I listened to my complaints of leadership, that is let me calm, should re install best antivirus for PC, on the help of leaders, my computer is good, but also because the best antivirus for PC the problem, but this time I use the genuine best antivirus for PC, so it should be what problem.