"clean" or not, Avast say it's infected with the Win32.Sality virus (a pretty nasty one). Same for the prior version. It's not the main file that is alarming, but one of the 32bit drivers under it. Until Yuneec addresses and corrects this (whether by correction of code that may be causing a false alarm, consultation with Avast or a driver publisher, or removal of an actual virus), I will not be using this software on any system that I care about. It'll run only on a small, non-networked, unconnected, unprotected netbook that I can restore from an Acronis image in 5 minutes when I'm done. I have called this to their attention in the past and gotten only "oh, that's a false alarm". Very reassuring (not!). So far, this is my only real complaint with Yuneec; not taking a virus report on something they offer for download seriously.