Give a try to comodo perosnal firewall & antivirus. I'm using it
and I'm very satisfied, plus you will get very
good firewall, which you should have installed too,
because windows firewall is just very basic protection.
I disagree. Windows firewall is fine.
I used to recommend third-party firewalls over the Windows one
because they were two-way, and the Windows firewall only monitored
incoming traffic.
I've become convinced, however, that outbound protection is
meaningless. Once one of the nasties gets into your computer, it can
essentially do whatever it wants, including circumventing the
firewall. So the extra protection provided by a firewall that monitors
outbound traffic is more apparent than real.
If you don't want firewall, you can install only antivirus,
it is selectable during installation.
Other good and free antiviruses are AVG and avast, but both
can really slow down your computer.
I disagree again. Although AVG is not as good as it once was, Avast is
just fine. I recommend it, and the only anti-virus product I prefer is
NOD32, which has an annual charge.
Also note that you have mentioned only two of the three kinds of
necessary security applications. The third type is anti-spyware, and
because none of these is near perfect, everybody should run at least
two of these (but not at the same time). I recommend MalwareBytes
Anti-Malware, and Super Anti-Spyware (both free).