Most people use a standard antivirus program.
Most people use a standard antivirus program.
I rely on Bitdefender Free AV http://www.bitdefender.co.uk/solutions/free.html It runs smoothly with no intrusive ads or popups, unlike what others have said. I previously used MSE (Windows Defender on Windows 8) but it didn’t catch ZeroDay threats or malware. Now I regularly test my pendrive and hard drives on both my notebook and desktop PC.
Used AVG for a long time, now back to it after switching back. Norton Internet Security isn’t working well, so I’m planning to get the full version soon.
Technically Windows 8.1 includes a pre-installed version of MSSE, but does that matter? I haven't used antivirus software since around 2009. I still run SAS/MWB occasionally, though they usually only detect minor issues.