My home computer are not threat defense software, think about it is really very dangerous, and now every day and the birth of countless computer viruses spread, if not threat defense, then the computer will soon broken. I do not know before, the computer thought it was a problem I would not hamper the operation, was also restored the initial setup, of course, there is something missing inside the computer. The computer in the company, I am afraid of broke, but fortunately, my colleagues told me that in order to better threat defense, computers have installed security software, so do not worry you can rest assured that the use, with the threat defense software, it will not a virus.