If one is going to use "Fuckrosoft" (hahaha) then I think security essentials paired with something you can't install on a machine, common sense, is adequate protection. Of course, if one prefers Avast (which I've used before and would recommend as an alternative) that's their choosing. I find peerblock with it's ads and spyware blocking features to be something worth running, I see no reason not to as you can just quickly disable it if something isn't showing up correctly. I'm not saying that I recommend peerblock as a safe way to torrent naughty files, but I do think it's a good way to enhance overall security and extremely simple to use.
update: microsoft's extended support for xp will continue until april 8, 2014.
Honestly Fuckrosoft could support it until 2024 if they weren't out looking to push their latest wares. On my desktop PC though, I've very comfortably shifted to 7 and I think both XP and 7 are the most comfortable/stable OSes that have come out in the often (and for good reason) maligned Windows series. This new dual-sided tablet OS thing they're pushing now doesn't interest me at all.
Speaking of malware and viruses, how many of you have gone to a friend or family member's house and gotten the dreaded "can you take a look at my computer?" I remember in around 2005 trying to help a friend clear out his ill machine using the HiJackThis analyzer which found a vile treasure trove of all sorts of malware from the mundane to the hilarious. Unholy lord, I think he was still using IE6 at that point and with all the junk toolbars and crap it was like surfing the web behind a knight's suit of armor. It took all evening to sort out that poor PC, but he made sure there was plenty of beer so it was all good. I don't think he's touched IE since then, but I know he has destroyed another computer through just being totally aloof. haha.