I think you unfairly characterize a lot of Windows AV. Yeah, they're not perfect - if you're browsing dodgy sites, downloading tons of cracks, and clicking on

I think you unfairly characterize a lot of Windows AV. Yeah, they're not perfect - if you're browsing dodgy sites, downloading tons of cracks, and clicking on every link, there's no application on Earth that can stop you from getting infected. However, an AV is pretty good at detecting stuff that you may get exposed to otherwise - exploits can pwn your Windows computer without you even knowing, and sometimes even run off legit ad networks. NoScript / AdBlock, running Google Chrome, and practicing safe browsing can help, but an AV is a good additional layer. I guess my point is - an AV is NOT a panacea, but it should be used as an additional layer of defence.