I can see there are virtualization softwares like shadow defender and some seem to be very popular but they do not have any company information and nothing! How do you trust them?
But you trust Microsoft (Since they have a company information)? That's brave I would ditch MS in a heartbeat if there is any other option to play games (Mmorpgs) not talking about angry birds or so.
What kind of trust? That they won't steal your data? You don't get that with anyone. You have to decide what you are willing to risk by using any product. As far as virtualization software I just use VMware or VirtualBox or something and just create alternate instances of OSes and use those when anything is questionable. Make snapshots and roll back the changes when there is a concern.
There is a lot of apps mentioned, discused and actualy developed on this forum that are not know at the beginning...they are analysed and checked in diferent way by users - processes, in/out connections, created files/folders, system files modifictaions, efficiency, bugs/issues, etc - and thet's the base of our opinion and then our trust.
VT is an overview, but vital for trust. VT only has signature scan, nothing else, it do not hold any other lists. see also https://forum.avast.com/index.php?topic=227825.0
I trust software after I come to trust the companies in most cases. ShadowDefender might be the exception, but over time and using SD I have come to trust it. How to come to know the companies. In many cases by testing for them.