Computer protection

Hi,

Would anyone know of any Anti-Virus software that can protect computers connected to the LAN? Also any AV that is not an Anual Subscribtion but also not free.

The reason being is that I don't want to be paying anually for a software. I rather just have a once off fee and thats it!

The reason being is that I don't want to be paying anually for a software. I rather just have a once off fee and thats it!

Elite-Realist