I just got a Windows 8 laptop with detachable screen to make into a tablet (HP Split 13 x2 [goofy name ...]).
Before I installed (60-day free Norton) (and before I knew what was going on with Windows 8), I got infected and was ready to throw this thing in the trash. But I was able to do a factory reset ("refresh") and things seem quiet. I had this dumb "Download Manager" and couldn't even download Chrome or Firefox (but I have done that after the reset, and they look fine).
So my question is anti-virus. I'm not a big fan of Norton, though I have no technical reason for this. I do like Malwarebytes and Windows Essentials (which I have on an HP laptop), and I have Panda on two HP desktops (but it seems so passive, I never can tell if it's doing anything or not).
The Best Buy guy recommended Malwarebytes and Kaspersky.
Thoughts on Norton vs Malwarebytes / Kaspersky, also Windows Essentials.