There are so many different types of free PC antivirus programs out there today. You can simply find these programs online from various websites. Most of these do not last long, and you may have to take note of them being just a free trial. However, there are some descent ones that can work well to protect your computer at no charge to you at all. Programs such as SpyDoctor can be downloaded for free online. This is one of the best computer programs that you can get to help protect your computer from viruses. A lot of people find it hard to believe when it comes to antivirus programs that are free. They really do exist. The best way to find which programs they are, is to basically look online and read the reviews and ratings. There is a big difference between free trial and free. Free trial means you only get a certain amount of time to enjoy the program, but it will expire soon, meaning you will have to buy it. Free means you will not have to pay for anything at all. These can be easily attained online if you research them. They are out there.