I use Bullgaurd Anti Virus, it covers everything, Spamfilter, Anti Virus, Firewall, allows you to create backups. And the technical support is excellent! I find it to be a very good piece of software, and even if a virus does get onto your system, Bullgaurd will find it straight away and put it into "Quarantine". From there, you can delete the virus, no more problems!
I would recommend it to anyone, I used to have Norton Antivirus, and that let through a virus that corrupted my system, last Christmas (not the Christmas gone). And Even though I could still use the system, I couldn't delete the virus. Whereas with Bullgaurd, it seems to sort anything.
Jack.