There are many anti-virus programs among the internet. Some are great, while others are not. today, I will tell you all what are some great anti-virus programs that are free. Many run from above $50.00, and typically, these are a great investment. If you are in college, saving money for the next big thing, or simply cheap, this is where to go.
Windows firewall is great and you do not need a third party firewall. Since this is a tutorial on anti-virus, we shall stick with anti-virus( that, and i don't use anything else).
The first thing you are going to need is Spybot Search and Destroy. This will clear your computer of a lot of stuff that most programs can't get to. It also speed up your computer by deleting some files, and the viruses which slow them down.
Download link: http://www.safer-networking.org/
This is the one i personally use. It is free and easy to use. THere are some paid options however, an it can get very annoying. But it is very effective and keeps a lot of stuff out.
This is not ongoing protection. However, this is a great tool for cleaning out malware and other things. MAKE SURE TO GO FOR THE FREE OPTION.