Use this forum to ask question regarding installation and configuration issues.
Virto Commerce comes in two flavours: SDK and Source Code. The installation instructions regarding installing each one of them can be found at the following locations:
Installing on azure guide - http://docs.virtocommerce.com/display/vc1devguide/Source+Code+Azure+Deployment
You can also use Microsoft Web Gallery to setup Virto Commerce on premised or in azure http://www.microsoft.com/web/gallery/virtocommerce.aspx.
For azure, login to your management portal and click create new website and pick Virto Commerce from the gallery in there.