Well, I have previously tried several antivirus programmes but have stayed with BullGuard Internet Security for the past four years. It works well for me so I have no plans to change.
Have a look at the reviews on the BullGuard home page.
Why not try a free 60-day trial of BullGuard Internet Security 10? A new version (12) is in the BETA stage.
I did NOT get paid by BullGuard for writing that!
:-)