UK's Sophos isn't exactly struggling. Always one of the better ones back when individual anti virus mattered. Their Network Protection - UTM still seems well thought of. I think it's even free for home use.
Completely unlike the vastly over priced marketing junk of McAfee and Symantec that got pre-installed on just about every Windows machine. First thing to do with a friends machine? Get them to install something else instead and see the performance gain!
Oh, and Spybot Search and Destroy (German) was first choice for getting rid of the crap Norton and McAffee happily let in for about half a decade or more, and just about only choice for a while.