Install Oracle VM VirtualBox On Windows 7

Introduction
Oracle VM VirtualBox allows you to run more than one operating system at a time.
you can run multiple Operating Systems on another(for example, Linux and Mac on Windows software).

Who wants to read more about the advantages of VM here is a section of Oracle VM VirtualBox documentation:

sounds interesting? then let us start.
First download the 'VirtualBox-4.3.18-96516-Win.exe' from:
http://www.oracle.com/technetwork/server-storage/virtualbox/downloads/index.html
you need download Python from: https://www.python.org/downloads/windows/
and install it on Windows System

so the VirtualBox installation can be started.
1-- double-clicking on the 'VirtualBox-4.3.18-96516-Win.exe'
2-- The installation will display welcome dialog there you can
choose where to install VirtualBox and which components to install.

Attention: If you have more than one user in the Windows-system, and you want to install VM only by the current user,
then you must install Oracle VM VirtualBox as follows:
First navigate through 'cmd' to 'VirtualBox-4.3.18-96516-Win.exe' and execute the following commands
1-- VirtualBox-4.3.18-96516-Win.exe -extract
2-- VirtualBox-4.3.18-96516-Win.exe -msiparams ALLUSERS=2

Oracle VM VirtualBox supports additional following packages:
1-- USB support(special drivers for your Windows)
2-- Networking(extra networking drivers for your Windows)
3-- Python(scripting support for the VirtualBox API,for this to work
it may be that you get warning 'unsigned drivers' or similar, this is depending on your Windows configuration there select “Continue”. Do not worry your VM will function correctly after installation.

so your installation is finished and I may congratulate you.
you can now launch the VM from Windows "Start" menu.

continue with: Install Oracle Linux 7 on VirtualBox