F-secure Client Security 9 version is very good and faster
It is is using the world's best technology called
Even if you do not have latest updates it will take care of new
It has strong firewall / Intrusion prevention / Website
protection and many more feature..
Have you tried ???
Try for 90 days .. i.e for 3 months... which is sufficient...
I am not sure.. that you are looking for FREE anti-virus