In the older set of videos I am using VMWare->Oracle Linux 4->Oracle R12.
In the newer set I am using VirtualBox->Oracle Linux 6->Oracle R12.
Both processes will work just fine on any flavour of Windows because you can install VMWare and VirtualBox on any flavor of windows. So windows flavour is out of the equation.
"few days" could be 2 to 3 in best case. A week in worse case. Sorry, I cannot promise anything at the moment. These are the best estimates I can provide.
If you can wait, then that is fine. Otherwise please go ahead and do the installation using the old set of videos. Oracle R12 will work fine if you follow any set of videos to the core.