Win 8 / Metro style which is only great for Windows 8 touchscreen devices, nothing else.
Strange, I don't have a touch screen yet I have both Windows 8.1 and avast! 2014 Free - Pro and IS
All of these work very well even without a touch screen.
Actually, avast! 2014 works in the background so, outside of the occasional VPS update notifications, I don't even know it's there.
Agreed Bob, I simply do not understand this fuss about the GUI.
I have Win8.1 on an Acer laptop, I don't use the Windows menu or tiles, I have Start8 and go to desktop, and have no touch screen. Personally I think the avast9 GUI is the best they ever produced.
It is neat, clean and easy to use.
My son has Aspergers Syndrome and is very averse to change, but he prefers this latest GUI, he says it is much easier to understand, the layout is more intuitive.
I have installed avast9 on XP, Vista, Win7 and Win8 for at least 30 people, there have been some issues, now resolved, BUT nobody has complained about the GUI, the comments have all been very positive.