Stupid question. The answer, of course, is that there is nothing better than getting something for nothing. It does not happen too often though so when you are offered that sort of deal you really need to seize it when the offer comes around.
One such offer are the free Antivirus downloads you can find at this link. Sure, you can pay fifty dollars or more for an antivirus package. If you have money to burn then go ahead. On the other hand, if you care more about how well you are protected rather than how much you pay, you may want to check this link out. You will find quality, reliable anti-virus software from a source you can rely on. There is a lot of nasty stuff floating around the internet. The last thing you want is to download a compromised anti-virus software package.