I use Avast Antivirus and if I ever get rid of a virus, fix it manually but there are some good programs to do that too. Avast is the best Antivirus, though.
Also, I turn Windows firewall off, you don't have to do that but it will make your computer run a lot better because it don't do shit. I don't use a firewall at all, not even on my server, it's too much work to configure it to work right.