Virtualbox is a virtual PC, made possible by Oracle. The idea is to run as many PCs as one would deem necessary within one host computer. To run a copy of Windowws, one would not need to have a product key. 

The idea of my downloading the Virtualbox and attempling to use the system, Bitcoins. I would like to see if I could mine Bitcoin, or another alt currency through these virtual computers. I would think it should work. I will soon see, though.