Comment My Experience (Score 3, Insightful) 467
For Windows 8 there is no need as Microsoft Security Essentials, renamed Windows Defender, is good enough. Otherwise I use Avast, which seems to work well and comes with a few handy options like a software updater and the option to run a scan at boot time. Though it can be annoying recently as it reminds you of other paid features like VPN tunnels.
Steer clear of Norton for God's sake, it seems as bad as the disease itself. I dislike Symentec and had problems in the past with AVG. A few years back an update prevented browsers from accessing the internet.
If you think you may be infected try running a scan of the free version of Malwarebytes, it gives a good second opinion and is great at cleaning up some infections.