Recently my computer started acting up. For no reason it shuts down unexpectedly. I thought there was a virus but the antivirus didn't detect any viruses on my computer maybe is hidden. I really need your help what programs can I use or buy in order to protect from all viruses, spyware, adware, hacker you name it. Any suggestion of how to stop these? I'm concern about security and privacy when surfing the Internet. Need guidance. thanks