Adaware Antivirus is always free. I find it a very good antimalware solution. You have to enter a product key to activate it. That key is free when you apply for it with an email. The key is good for 1 year. You can get a new free key once your subscription is finished. If you already have an antimalware program on your computer, Adaware Antivirus will install in a particular way so that it won’t be in conflict with the other program.