Many people want protection from computer viruses, but it can be hard to know which software to trust. The web is full of choices, but if you are looking for free protection for your computer, go with a program from an established security software company. You can find roundups and reviews online and the AV-Test.org site has a list of well-known software creators. Programs that pepper your screen with pop-ups or try to convince you that your computer is full of worms and viruses are often spyware or scams themselves.
Read a whole article about how to get free protection software for your computer here.