First install virtualbox then install Windows 7 in virtualbox.

1. First install virtualbox then install Windows 7 in virtualbox.
Watch "Download and Install VirtualBox 4.2+ in Ubuntu 12.04" on YouTube -

https://youtu.be/2_3r5U67Fu4

2. Watch "How to Install Windows 7 in VirtualBox within Ubu…" on YouTube –
How to Install Windows 7 in VirtualBox within Ubuntu 12.04…:
https://youtu.be/1DhwS4eZExU

THANKS to my DEAR HTAT Friend. KAUSHIK MOTIVARAS. Porbandar.